Writing with Colour
At school I would begin with an activity on primary colours.. I would pass out a piece of paper that had 3 circles in a triangle. I them passed out a few toothpicks and a dab of red , yellow and blue from tubes of oil pastels. The students would use the tooth picks to paint the primary colours in the three circles. Then they were asked to mix the colours between the circles. What colour do you get between the red and yellow Circles?
Next we talked about taking the colours apart.
We used coffee filters and markers. The markers must be water soluble. We placed dots from secondary colours on the filters and allowed water to spread up the filter.
For homework I gave each student a coffee filter but encouraged them to try different types of paper like paper towels, napkins or newsprint.
We also discussed how a black marker should break down into many colours.
The next day we placed our homework on the bulletin board.
You could use this method to test Kool-Aid or m&ms to find out what kind of dye was being used.
Imagine you are having friends over for a party. You plan on serving Kool-Aid but you know a friend is allergic to blue dye. Use Q tips and paper towels to test 3 kinds of Kool-Aid for blue dye.
Would it be save to serve your friend Lemon Lime Kool-Aid?
place dots from soluble markers on coffee filters or paper towel.
Place paper in water so that both dots are above water.
As water reaches the dot it dissolves and spreads the different dyes in the ink.
Place paper to dry and display.
A picture of a chemist using chromatography
Mikhail Tswett Born May 14
Black Magic A very nice page on paper Chromatography by Exploratorium
University of Missouri Check out Christmas Chromatography
Thank you for visiting the Chromatography page.
The last time I checked this page was April 7 2010.
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