The Artist's Chromatic Hand-Book —— Being a Practical Treatise on Pigments; Their Properties and Uses in Painting， to Which Is Added a Few Remarks on Vehicles and Varnishes

----- 艺术家的彩色手册

ISBN: 9781330175118 出版年：2016 页码：143 John P Ridner Forgotten Books

As pigments generally do not possess the brilliancy of pure white， it is necessary to break down or lower the tone of the latter， else it will degrade the former.