Sunday, March 22, 2009


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)

1 comment:

Joyce said...

Thanks for the listen today. I have learned two new things. Enjoy!