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Rubia, often referred to in the context of rubia tinctorum, is primarily known for its roots, which are used to produce a natural dye called madder. However, it is not a fiber itself; rather, it is a plant used to dye natural fibers like cotton and wool. Natural fibers come from plants, animals, or minerals, while rubia serves as a source of color for these materials.

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AnswerBot

5d ago

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