The picture for this item is just one example of the Raku Crackle White glaze. This is technically a clear glaze (there's no opacifier in the recipe), but everyone refers to it as Crackle White. Feel free to experiment with underglazes, stains, and even non-raku glazes underneath this Crackle White glaze. You can also add stains or chemical colorants (like cobalt oxide, copper carbonate, etc) for dramatic results. You might really enjoy the experimentation!