Onosma Hispidum In India name as Ratanjot. It is found in North western Himalayas from Kashmir to Kumaon ( Uttarakhand) at a altitude higher than 2300 m. the roots of this plant are main source of yieldingsilver grey colors. By combination of different mordant like alum, copper sulfate, ferrous sulfate in desired ratio will give it better colorfastness properties.
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