“Naples Yellow Paris (Lead Antimonate Yellow) is an opaque ocherous yellow, fine-grained with medium tinting strength. This is genuine lead antimonate yellow made according to historical recipes. This is the historical pigment (not a mixture of pigments to make Naples yellow hue) ground in linseed oil without any additives (e.g., stearates, waxes, etc.) or fillers typical of modern colors. It is ground on stone mills repeatedly to a smooth paste. Hold the paint tube in your hands, and you will feel the difference from convenience hue paints made by other manufacturers—the genuine color is so much heavier. Load your brush with it and see the difference. Lead antimonate yellow was made at Thebes from the sixteenth to fourteenth century B.C.E. It reached its highest popularity in European art between 1750 and 1850. It was gradually replaced by chrome yellow (lead chromate) and, later, cadmium yellow (cadmium sulfide). Lead antimonate yellow has not been rated for lightfastness by ASTM International. Still, independent studies have shown that it is permanent in most vehicles and, according to Doerner, can be used with all other pigments without alteration.” -Natural Pigments