[7] Massa, L’arte genovese, 119–120 and 211. The full list is oak galls, copperas, gum arabic, filings of rusty iron, madder, vinegar and soap: “galla, vitriola, goma, limagia rausìa, roza et acceto e sapone” (211). Nothing else could be added. If used, madder could have contributed a warmer shade to the black achieved.