Colour Fastness to Spotting: Acid and Alkali
Undyed and dyed (bleached & modified) okra bast fibres were combed and compressed enough to form a sheet of 10 cm × 4 cm. The specimens were spotted with two drops of acid or alkali solution at room temperature. The surface of the specimens were gently rubbed with the glass rod to ensure penetration. The specimens were dried by hanging them in open air at room temperature. The change in colour of the specimens was assessed after drying with Grey Scale. In the same way, the change in colour was assessed by the solution given below.
(i) Acetic acid solution containing 10 g/l.
(ii) Nitric acid solution containing 10 g/l.
(iii) Sulphuric acid solution containing 10 g/l.
(iv) Sodium carbonate solution containing 10 g/l.
(v) Ammonia solution containing 10 g/l.
(vi) Sodium hydroxide solution containing 10 g/l.
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