| 21. | In 1868, German chemists Carl Graebe and Liebermann were able to synthesize alizarin, and to produce it from coal tar.
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| 22. | Alizarin is the main ingredient for the manufacture of the madder lake pigments known to painters as Rose madder and Alizarin crimson.
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| 23. | Alizarin is the main ingredient for the manufacture of the madder lake pigments known to painters as Rose madder and Alizarin crimson.
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| 24. | Alizarin itself has been in turn largely replaced today by the more light-resistant quinacridone pigments developed at DuPont in 1958.
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| 25. | Free ( ionic ) calcium forms precipitates with alizarin, and tissue block containing calcium stain red immediately when immersed in alizarin.
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| 26. | Free ( ionic ) calcium forms precipitates with alizarin, and tissue block containing calcium stain red immediately when immersed in alizarin.
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| 27. | Their research helped with the creation of the synthetic alizarin industry, or the process of replacing natural dye obtained from madder.
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| 28. | After synthetic pigments and dyes such as alizarin were invented in the late 19th century, natural-dye production gradually diminished.
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| 29. | Alizarin crimson is a dye bonded onto alum which is then used as a pigment and mixed with ochre, sienna and umber.
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| 30. | In 1835, a " T�rkisch Rotgarn " ( an Alizarin red color ) dye-works opened in the village.
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