Its made out of...woad! Woad is a plant that was commonly grown
throughout Europe and Asia for its dyeing properties.
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The Woad Ode was created by Sir John Betjeman in 1936.
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Woad (the plant) is pronounced with a long O, as in road.
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Woad leaves contain indigotin, a chemical that can be used to
dye cloth. Woad was used to produce indigotin until modern
synthetic dyes were developed.