Lovevery liquid color lab from the “Problem Solver” Play Kit for Months 43-45. Experiment with self-directed color blending with 6 test tubes and a water dropper with a stand to hims it upright. There is a container that came with color tablets (what comes in Easter egg dying kits) with red, yellow and blue tablets - these were all used, but could be a silly replaced with the same tablets or food coloring.