Fast Bases - Salts are highly sensitive to heat and moisture and need to be always stored in cool dry place. Being freely soluble in water, it is used in dyeing process in two stages.
- The first stage, involves material getting impregnated with naphthol solution.
- In second stage, further development takes place with use of diazotized fast base.
Combining chemically with naphthol, it gets absorbed by fiber thus providing insoluble dye on fiber. These can be used in different dyeing methods including tub-dip, open beck, jigger, circulating liquor and padding methods where different material to liquor ratio is used in different dyestuff concentrations for achieving defined shades. These dyes are skin friendly and easy to apply.
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