The dyeing of cotton fabric with dye solution is also pH dependent.
In order to optimize the pH, dyeing was carried out at various pH values (6–10) using irradiated dye solution.
Colour strength values as shown in Fig. 4 demonstrate that irradiated fabric dyed at 10 pH is more darker in strength.
While dyeing at acidic and slightly basic pH gives dull shades.
As dye is basic in nature, so in acidic medium,