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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
manganese enriched form of goethite, a naturally occurring inorganic iron oxide. it is a brown earth pigment that is darker than the ochre because of its manganese and iron oxide content. it is highly valued as a permanent pigment either in the raw or burnt state. umber is lightfast, insoluble in water...
https://www.nrochre.com/natural-iron-oxide-pigments