cudbear

The lichens thus treated acquire gradually a deep purple colour, and form the products called "cudbear."

About 130 tons of cudbear are imported annually from Sweden.

Purple:—For each pound of goods, two ounces of cudbear; rinse the goods well in soap-suds, then dissolve cudbear in hot suds—not quite boiling, and soak the goods until of required color.

If a wine colored with archil and one colored with cudbear are treated treated according to Romei's method, the former gives, with basic lead acetate, a blue, and the latter a fine violet precipitate.

Various species of Lecanora, particularly L. tartarea, known as cudbear, are used in dyeing woollen yarn.