William Adolphe Bouguereau, that hero of French Academism, is known to have used Siccatif de Courtrai almost exclusively as his painting medium, not only adding the powerful drier directly to his pigments, but also using it to oil-out dry surfaces before adding a subsequent layer of fresh paint.  According to a British student of Bouguereau, however, Siccatif de Courtrai was only used for oiling out when the Frenchman was trying to create a tacky surface on which to work, and at all other times he used medium which was much, much different.