“So take peach kernels / put them in a new pot / and put a fitting lid on them / the lid should be sealed so that no steam comes out / otherwise the kernels would become completely ash. Bring the pot to a potter who is going to a kiln / so that he adds it to the other pottery in the oven. When he finished burning / so take the pot and open it, then the stones are coal black. These pound in a mortar very small / and grind long and well / on a stone / until they are no longer rough. Then temper it with which binder you want / so you have a nice good black.” In: Boltz von Ruffach. 1549. Illuminier Buoch: p. xcvii-xciii.