I had some plain hand sanitizer (alcohol-based) to get rid of and another teacher asked about ordering some colored rice. Having plain rice on hand – viola’!
In a jar, I put 4-5 squirts of sanitizer and several drops of food coloring. I scooped in a couple of handfuls of rice, stirred it up and spread it out to dry. I normally do this with a tablespoon or so of rubbing alcohol, but this worked great! Each batch of color was dry within half an hour. (And think how clean it is!)