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https://www.nrochre.com/products/natural-iron-oxide-pigments
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 non-toxic.
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Raw Umber
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Yellow Ochre
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