Ochre is a naturally occurring clay rich in iron as it is a mixture of ferric oxide and various other clay and sand components.
It is a naturally occurring pigment; its color can range from red, brown, orange to even yellow. Ochres have been used for wall paintings since prehistoric times.
Ochres are non-toxic in nature and are used to produce oil paints that dry quickly. Synthetic iron oxides are used to manufacture modern ochre pigments.Ochre exhibit several remarkable physical properties, which drive their applications in a variety of sectors:
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