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nitric acid

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Ingredients used for dying of wool used at WPA (Works Progress Administration/Work Projects Administration) weaving project. Costilla, New Mexico. They are indigo, nitric acid, powdered alum, bark, burdock root, cochineal and walnut husks

Ingredients used for dying of wool used at WPA (Works Progress Adminis...

Picryl description: Public domain image of a great depression era, migrant workers, free to use, no copyright restrictions.