You may or may not remember in some ancient chemistry class studying or even performing chromatography. The short definition is using media like paper or powder to separate a mixture. It is an old technique, but [Suchir2004] is using it as an art form.

Chromatography works because the parts of the liquid mixture travel through the media at different speeds. While experimenting, [Suchir2004] noted that black ink and water perfused into constituent pigments. A butterfly ensued.

Is it art? Yes! Is it science? Well, sort of. Especially since the post does talk about how the effect works and even does some simple tests to start. This would be an excellent project for a class where some students are more motivated by art and others by science. Even with an individual kid, it might show you where their interests lie.

There’s nothing particularly difficult. A sketch pen, some paper, a coffee filter, a glue stick, and a few other household items are all you really need to get started.

Want something more practical? How about measuring caffeine content?