A book I read in the Purity Vats strongly suggested that Mandrake Tincture and Demon Bile could be used to Perfect Shaped items. So I took the Shaped Breastplate I got from Alwan, some tincture and some bile to the mines. Tincture + bile + breastplate did nothing. Tincture + bile produced purifying elixir, but elixir + breastplate did nothing. What am I doing wrong here?