CSI


 * [[image:room41taurangaintermediate:Screen_shot_2011-05-16_at_8.27.28_AM.png height="416" caption="Screen_shot_2011-05-16_at_8.27.28_AM.png"]] ||
 * Screen_shot_2011-05-16_at_8.27.28_AM.png ||

Learning Intentions:

 1. To become familiar with //chromatography// and be able to apply it to 'real life'  situations.

 2. To perform 'fair tests' in Science identifying substances and fibres.

 3. Identify and group finger prints into 3 main categories: Arch, Loop  and Whorl.

 4. Set up and carry out Scientific Experiments following the correct process  of; Aim, Equipment, Hypothesis, Method, Results and Conclusion.

 5. Work collaboratively with peers to solve problems using the skills learnt.

Lesson One - Paper Chromatography

Chromatography is a technique used for seperating mixtures. In all of the variations of Chromatography, a substance is placed onto or into a medium and then a solvent passes through the test substance, some of the test substance may be attracted to the solven and follow it up in the medium. Different types of molecules are transported different distances, causing them to seperate. In these activities, filter paper is the medium, solvent is the solvent and black ink is the test substance. Chromatography is used in crime labs to seperate the components of 'clue' substances such as blood, ink or other mixtures found at the scene of a crime. Chromatograms of these clue substances are then compared with those of the suspected sources.

__Chromatography Monday 9th May 2011__

 __L.I__ I am learning the process of the chromatography and use this  to assist with solving the crime.

 __Aim:__ To use chromatography to distinguish which pen was used in the ransom note.

 __Hypothesis:__ I think that the felt is the pen because it is the same sort of ink and size.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Black marker x5 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Casade marker x14 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Sharpie x3 <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 18px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Vivid x4

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Equipment -__ Beaker, felt pens, ransom note, filter paper, water, hand lens, masking tape and straws.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Method:

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Gather samples of pens. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Draw a line across a strip of filter paper, 1-4cm from the bottom. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Attach to straw with masking tape. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Put filter paper in beaker, making sure the ink is at least 1-2cm above <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> the water. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Observe. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 6. Remove filter when water has travelled about 3/4 of the way up the strip. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 7. Compare results with the ransom note results.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Results - <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Black Ballpoint Pen <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Vivid <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Cascade marker <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Sharpie <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Black marker

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Reflection - (write here what you have learnt during this lesson).

__Lesson Three - Kitchen Chaos Wednesday 11 May 2011:__

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> The kitchen cupboard has got very damp and the labels have fallen off some <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> of the containers. From the label scraps it is found that there is:

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Icing sugar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> baking soda <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> salt <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> cream of tartar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> cornflour

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK - Make order out of chaos

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Use a series of simple tests and good observations to find out what substance is in <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> each container.

<span style="color: #009f00; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Caution: You are not allowed to taste them! Please use small quantities.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Aim: to find out what the substance is by carrying out a series of simple tests.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Hypothesis: <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> I think that the substance in the different containers is;

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance A - Cream of tarter <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance B - Salt <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance C - Baking soda <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance D - icing sugar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance E - corn flour

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Equipment - Five containers with the different substances labelled A, B, C, D, E. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> - Eyedroppers <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> - Vinegar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> - Magnifying Glass <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> - Litmus Paper (red and blue) <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> - Iodine

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> CLUES TO HELP YOU...

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Cream of tartar is an acid, and turns blue litmus paper red. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Cornflour and sugar are neutral and don't affect litmus paper. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Salt and bicarbonate of soda are alkaline, that is they turn red litmus paper blue <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Bicarbonate of soda fizzes when mixed with vinegar. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Iodine changes from yellow-brown to blue-black with cornflour. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> There are many different ways of telling the differences between substances. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> You could:


 * Smell them carefully.
 * Compare the way they dissolve in water.
 * Examine with a magnifying glass.
 * Test the acidity with litmus paper.
 * Test the reaction with vinegar and iodine.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Results: <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance A is cream of tater, Substance B is salt <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance C is baking soda, Substance D is icing sugar <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Substance E is corn flour

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Lesson 3 - Fossicking for Fuels Friday 13 April 2011:__

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> __Aim:__ to determine properties of different fibres/materials.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> (Record your results on the sheet provided then glue this into your Science book.)

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> __Equipment:__ <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. 3 different types of material. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. 2 beakers <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. 3 test tubes <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Force meter (spring balance) <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 5. Ruler <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 6. Felt pen <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 7. Magnifying glass <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 8. Tongs <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 9. Candle

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">THE TESTS

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK ONE - HOW MANY FIBRES ARE THERE IN THE MATERIAL?

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK TWO - WHICH MATERIAL IS THE STRONGEST?

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK THREE - WHICH FIBRES SOAK UP THE MOST WATER?

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK FOUR - HOW DO THE MATERIALS BURN?

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> TASK FIVE - WHICH MATERIALS STRETCH THE MOST?

<span style="color: #000100; font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> (Record results on the sheet provided)

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Lesson Four - Finger Prints __Wednesday 18 May 2011__:

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Every person's fingerprint are as different as each person. The use <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> of fingerprints is very important for the police whose only evidence at <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> a robbery might be the fingerprints left by the thief. Police keep a <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> record of fingerprints of criminals in banks of computers.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Different types of Prints

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: 0px; margin: 0px; overflow: hidden;">
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Loop Whorl Arch

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Your Fingerprints__

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Equipment - Pencil, Paper, Sticky tape, Magnifying glass.

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> Method <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 1. Rub the side of a pencil lead back and forth on a sheet of paper to build <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> up the black area large enough to take 10 prints. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 2. Press one of your fingertips firmly onto the black. Place the sticky side of a <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> piece of tape over your fingertip. (You may need a friend to help you with this.) <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 3. Tape the print to the correct location on the fingerprint form. <span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;"> 4. Using the magnifying glass compare your prints to the pictures above and try to label them as either arches, loops or whorls.

=My finger prints are different, some of them are loops and some have an arch.=

<span style="font-family: Chalkboard; font-size-adjust: none; font-size: 26px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">__Lesson 5 - Hair Analysis Friday 20 May 2011:__

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Learning Intention: We are learning to

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">1. think about the process involved in developing a technique for forensic analysis

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">2. identify the physical structures of hair

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">3. use our observational skills, critical thinking and microscopy

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Background information Unfortunately hair is not the best type of physical evidence for establishing identity. It is not possible to show with any certainty that two hairs came from the same person or animal. However hair can be used to rule out certain suspects or scenarios. It can also be used to corroborate (support) other physical evidence if it is consistent with the rest of the evidence.

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Guide to Identification

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Cuticle - Outer coating composed of overlapping scales <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;"> <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Medulla - Central core, this may be absent <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;"> <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px;">Cortex - Protein rich structure surrounding the medulla; contains pigment <span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;">

<span style="font-family: Arial; font-size-adjust: none; font-size: 28px; font-stretch: normal; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; margin: 0px; min-height: 32px;">Fill in the Identification Chart