Showing posts with label Synthetic Color. Show all posts
Showing posts with label Synthetic Color. Show all posts

Monday, January 11, 2010

A Difficult Indigo...

Around 1878, Emil Fischer* and his brother determined the structure of fuchsin, (a cherry-red dye) and were then able to develop a scientific method of synthesizing it. This procedure was used by many chemists who were trying to create new synthetic colors. The biggest challenge was to synthesize the 'king of colorants', indigo. By 1880, a German chemist, Adolf von Baeyer completed the synthesis of indigo in his lab, but couldn't find a synthesis that was cost-effective on an industrial level. After 20 years and 20 million marks spent, he succeeded. In 1904, Germany exported 9,000 tons of synthetic indigo, and 3 times as much in 1913. Whole regions were ruined - in India and the Caribbean; the English indigo trade disappeared and the shipping trade of Marseilles, wholly dependent upon it, also collapsed. (Delamare and Guineau)

*Emil Fischer - Organic chemist (1852-1919) devoted to the graphic representation of molecular structures, study of the major types of organic chemical reactions,and the study of colorants.

Sunday, March 22, 2009

Alizarin


Aside from the ochers, which are mined, today's pigments, lakes and dyes are produced by specialized chemical industries. The first synthetic dyes appeared on the market in the middle of the 19th century. Among them was alizarin, isolated as one of the main coloring agents found in madder. (Francois Delamare and Bernard Guineau)