Naples Yellow is a lead compound that has been superseded by the lead chromates, but is still now and then called for, but mostly in tube colors and coach colors. True Naples yellow is still sold by a few New York importers in two shades - light and dark. We shall refer to this pigment in considering artists' colors. It has also been known as antimony yellow. When imitation of Naples yellow is desired for use in quantity the light shade is made by tinting pure white lead with lemon chrome yellow, a very delicate cream color, and the dark shade by using a yellow-toned raw sienna and a trifle of chrome yellow to produce a clear buff tint.
Indian Yellow and Cadmium Yellows have no place in the list of ordinary oil colors, and will be dealt with in the description of artists' tube colors and coach colors. Aureolin belongs in the same class. Orange mineral may be classed among the yellow pigments, though it is really more of a bright red. French orange mineral branded Tours is in lead oxide what French process zinc is in comparison with American process zinc. Instead of hardening in short order like ordinary red lead, orange mineral in oil keeps in buttery condition when ground in linseed oil to paste form, and that made by the French process excels in that respect German process orange mineral or English orange lead. While ordinary red lead requires nine or ten pounds of oil to ninety or ninety-one parts pigment to form a paste, orange mineral requires from thirteen to fifteen pounds of linseed oil to from eighty-five to eighty-seven pounds of pigment for one hundred pounds paste in oil. Orange mineral is favored by many bulletin sign writers for use in place of the darker orange chromes because of its greater body or hiding power.