Chapter XXXI How to Make Yet Another Colouring
Take half an ounce of Roman vitriol, half an ounce of saltpetre, six pennyweights of salts of ammonia, half an ounce of verdigris, and pound them upon a stone, do not use iron. Pound the salts of ammonia first very carefully, then all the others together. Then mix them in a glazed vessel188 with as much water as shall make them have the consistency of a sauce, stir them over the fire with a piece of wood, & let them boil for such space as you can say two Paternosters. Do not give them a strong fire for that would spoil them. Everything in moderation. Let them cool, and use them as is here written in the manner following.
Footnotes
188 Pentolino.