red flavine
dye
Quick Summary
Red flavine is a dye derived from the inner bark of the black oak tree (Quercus velutina). This coloring matter is used to dye wool vibrant yellow or orange shades, particularly when wool is treated with aluminum or tin compounds.1
Red flavine is obtained by boiling an extract of the bark with dilute acid. This process deposits the dye, which is distinct from the yellow flavine also found in quercitron bark. While other flavins are biological pigments, red flavine specifically refers to this dye used in textiles.123
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