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=== Pigments and dyes === {{See also|Red pigments}} <gallery mode="packed" heights="150px"> Roussillon sentier des ocres2.JPG|Red [[ochre]] cliffs near [[Roussillon]] in France. Red ochre is composed of clay tinted with hematite. Ochre was the first pigment used by man in prehistoric cave paintings. Vermillon pigment.jpg|Vermilion pigment, made from cinnabar. This was the pigment used in the murals of [[Pompeii]] and to color Chinese [[lacquerware]] beginning in the [[Song dynasty]]. Red lead.jpg|[[Red lead]], also known as [[minium (pigment)|minium]], has been used since the time of the ancient Greeks. Chemically it is known as [[lead tetroxide]]. The Romans prepared it by the roasting of lead white pigment. It was commonly used in the Middle Ages for the headings and decoration of illuminated manuscripts. Rubia tinctorum - Köhler–s Medizinal-Pflanzen-123.jpg|The roots of the ''[[Rubia tinctorum]]'', or madder plant, produced the most common red dye used from ancient times until the 19th century. Alizarin-sample.jpg|[[Alizarin]] was the first synthetic red dye, created by German chemists in 1868. It duplicated the colorant in the madder plant, but was cheaper and longer lasting. After its introduction, the production of natural dyes from the madder plant virtually ceased. </gallery>
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