Sculpt-it colours is an air-hardening sculpting material that does not require baking. It is excellent for creating figurines, jewelry and free standing sculptures. Mix and blend colours to create new ones or marbling effects. It dries to a very rigid and durable hard finish overnight. Can be painted, varnished, sanded or drilled after drying. Does not shrink once completely dry. Non-toxic and conforms to ASTM D 4236.