Stypsis for every dyeing
From Africanus, from book 3. Stypsis toward every dyeing is this: first the animal, or also the hide, is washed off; for thus it would take on the things of the stypsis. Then one must dissolve alum in vinegar and smear whatever one would dye. Dried in the sun it is washed off and, freed of the moisture, it takes on every dyeing. Night and day one must keep the thing being stypticked under the stypsis.
Greek
8.2 Ἀφρικανοῦ ἐκ βίβλου γʹ Στῦψις δὲ πρὸς πᾶσαν βαφὴν ἥδε· πρῶτα μὲν ἀποπλύνεται τὸ ζῷον ἢ καὶ νάκος· οὕτω γὰρ ἂν πρόσοιτο τὰ τῆς στύψεως. Ἐπὶ δὲ τὴν στυπτηρίαν ἀναλυτέον ὄξει κἀπιχρίειν ὅπερ ἂν βάψαι δέοι. Ἀφαυανθὲν δὲ ἡλίῳ ἀποπλύνεται καὶ τῆς νοτίδος ἐλευθερωθὲν πᾶσαν προσίεται βαφήν. Νύκτα δὲ καὶ ἡμέραν ἐπὶ τῇ στύψει φυλάττειν χρὴ τὸ στυφόμενον.