Nine Books on the Nature of Things

In the transmutation of gems, understand that the world is situated in the two stages of tincture and coagulation. Egg white can be tinged with saffron and coagulated into beautiful yellow amber; with pine soot into black amber; with verdigris into green amber like a blue stone or turquoise; with green juice into something like emerald; with lazurium into blue amber like sapphire; with brazilwood into red amber like garnet or ruby; with purple colour into something like amethyst; with ceruse into something like alabaster. In the same way all other liquors, especially metals and minerals, can be tinged with fixed colours, subsequently coagulated and transmuted into gems.