Dixon Ticonderoga Company Dix08020 Prang Oval Pan Watercolor Set Educators Resource offers products for preK-8 learning materials and educational toys used by schools, teachers, parents and children. The preferred watercolors specified by schools and teachers across America. Semi-moist watercolor formula and choice pigments blended with specially formulated binders and dispersing agents has kept Prang watercolors a leader in the art world. Each has a white mixing box. Refills are available. AP certified non-toxic.