Indigo
It was used in European easel painting since the Middle Ages. Marco Polo (13th century) was the first to report on the preparation of indigo in India.
Manufacturer / product code: Kremer / 36005 (V.1); Kremer / 36000 (V.2)
Chemical description: fermented extract from the leaves of indigofera tinctoria, precipitated with aluminium hydroxide. Kremer PDF
Color: blue
Color Index: NB1
More info: Pigments Through The Ages Colourlex
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Raman spectroscopy 1064 nm
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XRF spectroscopy
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FT-IR Spectroscopy (Non-invasive Diffuse Reflectance Probe)
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