[30] Recettario Nuovo Copiosissimo (1550), 3v. The recipe appeared in cheap print already in 1529 in a ‘book of secrets’ titled Opera nvova intitolata dificio de ricette, and it was repeated in another cheap printed collection of recipes titled Recettario nuouo nel quale si co[n]tengono molti secreti mirabili (1546). The method was forbidden by wool guild. See Ortega-Saez, “Black Dyed Wool”, 72.