The homeschool den has a nifty science experiment using oil, water and food coloring showing how oil and water don't mix as the food coloring tries to make it's way through.
Good for ages 6 and up.
Get the instructions here:
http://thehomeschoolden.blogspot.com/2011/04/oil-and-water-fireworks-science.html
Meet the dubiens makes red ones and calls them lava bottles.
Get the instructions here:
http://www.meetthedubiens.com/2011/01/lava-bottles.html
Education explains the science of chromatography -- how oil and water don't mix.
Get the instructions here:
http://www.education.com/activity/article/Chromatography_liquid_fireworks/
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