Crackle Glazes are formulated to produce a beautiful cracked finish after fired, resulting in a unique antique and decorative look. Because of their transparency, Crackle Glazes can be applied over plain ceramic bisque or underglaze designs.Crystal Glazes create bright, multicolor bursts and specks, unique in every firing. Color crystals move in the glaze firing creating a distinctive colorful finish, depending on the size of the crystal, slope of the piece, and temperature of the fire. Clear glaze is available in 4 oz. or 16 oz. jars, colors in 4 oz. jars only. Sold as PACK OF 4.