χάλκανθον
From LSJ
Σοφὸς γὰρ οὐδείς, ὃς τὰ πάντα προσκοπεῖ → Omnia vel sapiens nemo est, qui prospexerit → Denn keinen Weisen gibt's, der alles sieht vorher
English (LSJ)
τό,
A solution of blue vitriol (copper sulphate), used for ink and for shoemaker's blacking, Dsc.3.80, Orph.A.960, Plin.HN34.123. II = χρυσάνθεμον, Ps.-Dsc.4.58.