I’ve seen dying rice with food coloring before, we used liquid watercolors, which worked pretty well. Rebecca really liked shaking the bags and squeezing the paint in. We also had some white beans which didn’t dye as well as the rice, the color rubbed off on our fingers, but maybe I just used too much?
After making an excessive number of colors – in my opinion, Rebecca kept saying “Now let’s make some this color!” – we made a big mess sprinkling and glueing. Looks like we had the spray bottles out too.