ink analysis

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ink analysis
By Sarah

I have done ink analysis (chromatography) with grades 4-7 before; my grade 4/5's did it a few weeks ago and enjoyed it! It is really very simple to do.

Black pens and markers look black but if you separate the ink then
you can see each pen is unique. So we set up a crime scene (which I can describe if you are interested), and basically each class member was a "suspect" apprehended at the scene and had to write their alibi with a black marker. We then did chromatography to compare their inks to the "crime note" left at the scene. So one student is the "criminal".
You need:
- black marker for

each child (I put tape with a number on each)
- piece of filter paper (from coffee filters)
- mixture of 70% rubbing alcohol and vinegar (I use 7:1 alcohol to vinegar)

Hmmm, rather than typing out all the instrucions, go here:
http://student.biology.arizona.edu/sciconn/crime/teacher_crime.html

Any questions, just let me know. It only takes about 30 minutes; it's dramatic to see; it's fun and everyone can do it!