Woad is not a colour per se but a dyestuff that contains indigotin, the actove ingredient as indigo although tne two species are not related. The dye exraction process for Woad is similar to indigo and it will give a range of blues from pale to navy. Pound for pound woad is not as strong as indigo, as a result the latter was preferred for dyeing. But from a technical perpective it is al but impossible to tell the two apart chemically.
Of note: rubbing woad on one's skin (the Picts) will not result in a true blue colour. It does apartently have some medicinal properties for wounds which may have been the basis for the story of the Picts/Celts/Britons etc using it..













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