Creativity Street® Tempera cakes are an economical source of brilliant, opaque, non-toxic tempera. Just wet with water. For a bright velvet texture, brush on any surface (even glass). No more messy spills! When colors are mixed directly on the blocks, simply rinse with water for a fresh new surface of pure color. Each tempera block is 2.25" in diameter. One tempera block will cover more than 16 oz. of liquid tempera. Six Color assortment includes: Red, Yellow, Blue, Green, White and Black. Nine color assortment also includes Brown, Purple and Orange.