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Indigo is now derived from naphthalene, and anthracene yields alizarin, the dye formerly obtained from madder root.
In 1868 the German chemists Carl Graebe and Carl Liebermann synthesized the alizarin molecule, which is responsible for the red colour of the dye extracted from the root of the madder plant.
Although the pigments were the same, ranging from costly exotic ultramarine to local vegetable dyes such as madder and indigo, a radical change of technique was needed when they were mixed with egg-white or plant-gum rather than oil.
Threads for the work have been dyed in authentic colours of the period, using natural dyes some of which have been derived from plants like cow parsley, madder and walnut tree, picked locally by society volunteers.
The roots of lady's bedstraw, a roadside weed in the northeastern United States, produce a red dye on wool yarn, as does the root of the madder plant, a perennial originating in the Mediterranean regions.
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