What plant yields a rich blue dye?

Md Ariful Islam

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Md Ariful Islam

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Most blue colorants around the world are derived from indigo dye bearing plants Indigofera tinctoria and Indigofera suffruticosa .

Indigo is a natural and substantive dye ( direct dye ) i.e. it gives a good colour when used alone and does not need a mordant.

Indian indigo is considered most superior. Indigo dye bearing plants used in other countries are :

Polygonum tinctorium ( Japan and coastal China )
Lonchocarpus cyanscens ( W. Africa )
Marsedinia ( Sumatra )
Isatis tinctoria ( N. Europe )

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