Is Indigo Blue vegan?

Vat Blue 1 is also known as Indigo Blue.

CI 73000 is an indigoid colourant, the compound commonly known as indigo, chemically 2-(1,3-dihydro-3-oxo-2H-indazol-2-ylidene)-1,2-dihydro-3H-indol-3-one. It can be produced synthetically or extracted from plants such as Indigofera species.

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