[1] “This black is made from booklets which contained beaten gold or silver. One should ignite these books with a candle, and let it burn. If they are completely burnt, one should let them fall into a clean bowl with water. Afterwards grind it and let it dry on chalk”, Anonymous. 1600-1650. Schoone consten ende secreten, Rome, Bibliotheca Apostolica Vaticana, Ms. Lat. 7279: fol. 24r, 24v. See https://digi.vatlib.it/view/MSS_Vat.lat.7279; here cited after Braekman. 1994. Antwerpse ‘consten ende secreten’ voor verlichters en ‘afsetters’ van gedrukte prenten: p. 116.