Q.36
Mordant that dulls all colours is:
- Chemical Action of Mordants in Natural Dyeing:
- In natural textile dyeing, metallic salts (mordants) fix dyes onto fibers and modify hue intensity:
- Iron (Ferrous sulfate / Copperas): Known as the saddening agent; it reacts with tannins and natural dye chromophores to dull, darken, and sadden all colors, shifting yellows to olive green and reds to deep purple/black.
- Tin (Stannous chloride): Brilliant brightening mordant.
- Alum (Potassium aluminum sulfate): Clear, neutral mordant maintaining bright natural shades.
- Chrome (Potassium dichromate): Imparts rich warm tones.
- Conclusion: Iron (Option 1).
Correct option: (1) Iron
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