Earth Yellows earth Most earth yellows are iron oxide pigments and many are mustardy in color. Among them are the ochres, Raw Sienna, and Mars Yellow. Naples Yellow, which is lead antimonite when genuine, can also be grouped with the earth yellows. All earth yellows except Mars colors are available in both natural and synthetic varieties; Mars colors are man-made.
Jim Snitily 2200 F Cone 5 - I brushed three coats in different directions of the black ( also added 2% black iron oxide to the base) Then applied 2-3 coats of the crawl with 4 inch wide brush medium thick, just so it goes on smooth, not runny. When that dries, it will crack and that shows its thick enough