A method of artificially producing the coloring matter of the madder plant, known under the name of " alizarin," has been recently discovered by Messrs. Graebe and Liebermann, of Berlin.

They might, however, plant beds every year, and after the first three years have annual crops. Madder is raised in narrow beds, about four feet wide, for the convenience of keeping it free of ...

Blue, yellow and red were three of the main colours of the Iron Age. The root of the madder plant produced a red colour, woad offered blue and yellow was derived from weld. Plants were soaked in ...