溶く
とく · toku · JLPT N3 · verb-godan
to dissolve (paint)
🎨💧 溶 = water 氵 + container 容: stir paint into a pot of water
The water radical 氵 marks liquids, and 容 means to contain or hold. 溶く (toku) is what you do when you mix powdered paint or flour into water in a bowl until it dissolves. It shares its kanji with 溶ける, to melt.