Crayola Air-Dry Clay hardens without the use of a kiln or oven. Its smooth, pliable texture softens easily with water. This natural, white earth clay hardens within a few days and can be painted with watercolors, tempura, or acrylic paints when dry. The generously sized, 5-pound bucket is ideal for classrooms and groups. Crayola art supplies and creative activities help children develop imagination while practicing fine and gross motor skills. Children can express, create, and connect with color. Watch kids' confidence and independence grow as they learn through colorful play.