Indigo |  |
Alias name: Indigo Blue; Indigotin; Indigo natural
We can see dark blue powder with our naked eyes. It is water-fast. It is absolute a natural pigment abstracted from the leaves of Polygomum tinctorium Lour e.g. blue Polygonum, blue tea, Strobilanthes cusia, woad by modern biotechnology. Widely used in every kinds of textile dyeing as blue coloring.
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