"The non-messy, successful every time, way to make pictures. Just twist off cap from the sponge tip applicator and start ""dotting"". Use it to trace lines, color pictures or just let the imagination loose to create one of a kind designs. Easy set up and clean up, no cups, brushes or water needed. Do-A-Dot is actually nontoxic, water based ink which allows layering and blending of colors. Available in a 4 pack Rainbow set with red, yellow, blue and green applicators.