11. Napoleon was forced to dye uniforms with woad , which had an inferior blue colour. 12. Weimar acquired woad trade privileges in 1438. 13. Merlin suggests an alliance between the Woads and the Sarmatian knights against the invading Saxons. 14. He was an expert on natural dyes and cultivated plants such as madder and woad . 15. Woad was still grown in 1827, when it was used locally for dyeing wool.16. Its other common names include dyer's whin, waxen woad and waxen wood. 17. Dyes included woad for blue and less frequently madder and lichens for reds and purples. 18. A third theory, according to curator at the woad , which is a common plant. 19. In Erfurt, the woad -traders gave the funds to found the University of Erfurt. 20. Small amounts of woad are now grown in the UK and France to supply craft dyers.
