[33] Walnut shells are listed amongst black pigments by Peacham in The complete Gentleman, 367 and in the Kölner Musterbuch. Köln, Historisches Archiv der Stadt, Best. 7020 (W) 293, fol. 4v; for black textile dyes see for instance Ortega Saez, Black dyed wool in North Western Europe, 1680-1850.