[91] Detailed descriptions of this procedure can be found in e.g., Cennini Cennino’s famous Italian Libro dell’Arte (fourteenth century), Broecke, Cennino Cennini’s Il Libro dell’Arte, 89-90, and in the so-called ‘Mayerne Manuscript’, Ms Sloane 2052, London, British Library, fol. c.1620-1655, fols. 68-70. https://www.bl.uk/manuscripts/Viewer.aspx?ref=sloane_ms_2052_f068r