Work on chalkboards, dry erase boards, light boards, windows, windshields, and other non-porous surfaces. They are opaque, water-based and pigmented. Clean up is super easy, they are erasable with a damp cloth. Broad Tip. Fluorescent Set includes: Blue, Green, Yellow and Pink. Primary Set includes: White, Black, Red and Blue. Secondary Set includes: Yellow, Green, Brown, and Violet.