Pearl Paperclay® is our school grade air hardening modeling material. It's a super-fine grained, pure white modeling compound that is ready-to-use. It is very pliable and takes detail extremely well. It's certified AP non-toxic and may be hand shaped or used with molds. It air dries hard in about 1-3 days or may be baked at 225° F (110°C) to speed dry. Dry pieces may then be colored with markers or any kind of paint.