Etsy seller QueInteresante is selling sticker sets that adhere to Crayola crayons and display the chemical compounds that make up a particular color.
Note: the crayons don't actually contain these chemicals, they're just the same color.
Children play and draw with crayons practically every day, so why not make the experience more educational? This listing is for a set of 48 Crayola crayons with labels so that while children are coloring, they are also exposed to the names of chemicals that will make those colors!
So instead of thinking "I want green" they will think "I want Barium Nitrate Ba(NO3)2 Flame" and then when they take chemistry in high school and their teacher sets some gas on fire and it makes a green color and they ask the class what chemical it was your student will know it was Barium! Genius!.
Link: http://blog.makezine.com/archive/2010/08/color_chemistry_crayons.html
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