Now that the U.S. Food and Drug Administration has banned Red Dye No. 3, artificial food dyes are under increasing scrutiny.

Archaeologists in Belgium uncovered traces of woad, madder, and pastel during excavations in Brussels and Mechelen, particularly near the stream in Zakstraat. These plants were crucial for the ...

botany and chemistry of the plant and the dye, and the object of the paper was to place on record information as to the technology and the cost of the preparation of woad. Fortunately, on farms at ...