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Natural (geniune) Indigo powder (36000) and Indigo pieces (36002) acquired from Kremer Pigmente.
Natural Indigo is gained from fresh leaves of the Indian indigo plant Indigofera tinctoria L. by the natural fermentation process.
ATR-FT-IR spectrum of natural Indigo powder (4000-225 cm–1)
ATR-FT-IR spectrum of natural Indigo pieces (4000-225 cm–1)
