Note 623 — INDIGO.
William Johnston translation
It deserves to be remarked, that the Greek dyers, speaking of a fermenting dye-pan covered with scum, used to say, like our dyers, that it had its flower, ἐπάνθισμον. In Hippocrates the words ἐπάνθισμα ἀφρῶδες denote a scum which arises on the surface. Among the Latins flos in this sense is very common.