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% natural iron oxide pigments "the most economical pigments in the industry." ochre (pronounced o'-ker) is a natural, mineral, earth pigment. chemically, it is a hydrated ferric oxide, chemical formulation: feo(oh). ochre is inorganic, chemically inert, non-reactive with cement, mortar or brick, and
achieve a range of colors from light buff to dark buff simply by varying the addition rate. as a way to achieve a broader range of colors with a higher yellow or red shade, ochre may also be blended with synthetic pigments and used as a cost effective base. ochre is a brown-yellow, refined natural iron...
https://www.nrochre.com/natural-iron-oxide-pigments