Botanical Name

onosma hispidum

Common name

purging nut

Other Name

physic nut, barbados nut

Part Used

trees bark & wood


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Color Ranges:

Product Descriptions:

Alkanet dye can not particularly soluble in water, and for best results an alcohol extraction is needed. The colouring matter in alkanet root is anchusin, napthaquinone derivative containing three hydroxy 1 groups, two of which are phenolic. As alkanet is a napthaquinone based dye theoretically it is expected to behave as a disperse dye. The colors that are produced on mordanted fabric and yarns are basically shades of grey, lavender and purple when used at 75-100% WOF. The colors achieved are beautiful but have moderate light fastness.

Dyeing Process

sodhani biotech

(A) Wet the fabric with wetting agent/soapnut(Reetha) or normal wash with water at 50 degree for 20 mins.
(B) Pre Mordant :- Pre-treat the material with alum 12% of fabric weight at 85°C for 60 mins.
(C) Dyeing :- Add the required amount of dye to the dye bath. PH of dye bath needs to be maintained at pH 4. If it is higher than pH, 4 add vinegar, if below pH 4, use lime or soda ash. Stir well to dissolve the dye. Add fabric to the dye bath and maintain at 95°C for 60-80 mins. We check all our natural dyes at 5% of fabric weight; you can amend the percentage as per lighter or darker shade required.
(D) Post Treatment :- Conduct soaping of the dyed material with non-ionic detergent (0.5gpl) or ezee soap at 50°C for 35 mins.
(E) Then conduct cold wash of the material at 50°C for 20 mins or more time.


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