The art of glazing is not only a creative pursuit, but also a delicate chemistry experiment. Glazes have been used since at least 5000 B.C.. There are numerous glaze recipes, which result in various color combinations, and textures. The ceramic artist will develop various glaze test tiles, to see what combinations will make the greatest statement to their work. Seeing the results from each firing is like Christmas morning, hoping for the best gift, beautiful pieces of pottery.