The natural dye was applied by immersing
the scoured fabrics in a dye bath containing
the dye extract (henna or onion skin) at
liquor ratio of 1:50 ml dyeing solution for
each gram of the sample, at room
temperature without heating. Then at 100
°C, sodium chloride was added along with
copper sulfate which was added as a
mordant (2-10 g/l) under closed dyeing
system. Finally, the dyed samples were
rinsed in soft water and then dried.