Het Schilder Boeck waerin Voor eerst de Leerlustige-Jeught den gront der Edele Vrye Schilderkonst in verscheyden deelen wort voor-gedragen. Daer na in drij deelen t'leven der vermaerde Doorluchtighe ...

He used an etching crayon of wax. soap and lampblack—and got the idea that he might cover the stone with acid that would eat away the part of the surface not protected by the crayon. It worked ...