Denise Lambert has spent decades rediscovering woad — and coping with blue hands. By Felicia Craddock Reporting from Roumens, France On an overcast day late last year, Denise Lambert retrieved a ...

Woad produced yellow dye, madder produced red dye, and woad produced blue dye. These plants were indispensable in the medieval cloth industry, contributing to the prosperity of cities like Mechelen.