#woad dye

[pig-mint]

The leaves of the woad plant (Isatis tinctoria) were used to make blue dye in Europe until the introduction of indigo from India, which contains the same dye but in higher concentration.

Pictured from left to right: woad flowers, Mel Gibson painted with woad in Braveheart, wool dyed with woad, woad leaves being weighed and powdered dye