De Medicina

8 The following are caustics: orpiment, blacking, copper ore, antimony sulphide, verdigris, lime, burnt papyrus-ash, salt, copper scales, burnt wine-lees, myrrh, dung of lizard and pigeon and wood pigeon and swallow, pepper, Cnidian berry, garlic, slag, both the milks mentioned in the previous chapter, hellebore both white and black, cantharides, coral, pyrethrum, frankincense, salamander-ash, rocket, sandarach, black bryony berries, chrysocolla, ochre, split alum, sheep's dung, vine-flower buds.

9 The foregoing generally induce scabs on ulcerations almost as when burnt by a cautery, but most of all copper ore — especially after being heated — copper flowers, verdigris, orpiment, antimony sulphide, and that also more after being heated.