Vol. 2, Issue 3 (2017)
The aqueous medium was used to extract the dye from the dry outer skins of onions and used for dyeing of wool (protein fibre) and cotton (cellulosic fibre) fabric samples in neutral and acidic/alkaline medium. Wool was dyed in acidic medium whereas cotton was dyed in alkaline medium. Pre mordanting with natural and chemical mordants was done at room temperature. It was found that wool dyed samples gave the better results in terms of the effect of different mordants, dye absorption, brightness and colour variation. On the other hand, cotton gave dull pastel shades. Also, wool samples showed good to excellent colour fastness properties against washing, perspiration, crocking and light fastness as compared to cotton samples. Finally, on comparing between dyeing of wool and cotton with onion peel extract, it was derived that wool had better substantivity towards onion peel extract as compared to cotton.
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