The reason for Erfurt’s wealth: Dyer’s Woad

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The reason for Erfurt's wealth: Dyer's woad

At the shop ‘Erfurter Blau‘ (Erfurt Blue) I learned more about the history of the trade in Dyer’s Woad. The prosperity of Erfurt is largely owing to the fact that this city was a big trading place for woad also known as Isatis tinctoria.