Here David’s working on a burnt mottle patina on one of two custom pieces. The piece has been buried in sawdust with a recipe of ammonia, water, salt and ammonium chloride for a few days until it is colored all over with blue-greens and browns. Sometimes we leave the piece in that state, after drying and cleaning it, but sometimes we want less green and more browns and golds so we burn the surface with a big torch.
