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Colored clays used since prehistoric times
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Colored clay, wrongly called ocher, is associated in nature with sand that can represent up to 90% of the raw rock. Once this sand was removed by washing and decanting, the clays constituted highly sought-after natural dyes used to color paints, mortars, or cement before the invention of chemical substitutes. Ochres were already used by men in rock paintings during prehistoric times.
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