the middle ages, when it was first used in cupels for the assaying of metals. interest in bone ash as an ingredient in tableware pottery emerged thirty years earlier - the bow factory in east london had some success in soft paste porcelains. their recipe was a carefully guarded trade secret and there...
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), also called the ivory snail. pomacea diffusa , wildtype colours. marisa cornuarietis . note that only one side of the shell is almost black. the other side (top) is not. except where otherwise noted, this page is licensed under a creative commons attribution-noncommercial-sharealike license ....