Used in textile processing to pre-treat fabrics before dyeing, ensuring optimal dye uptake and color consistency. Helps remove residual alkali from prior processing steps, stabilizing the pH of the material for uniform results in subsequent dye baths. Commonly applied in cotton and cellulose fiber treatments where pH control is critical for dye fixation and fabric quality. Also used in wool and silk processing to prevent fiber damage during dyeing by maintaining a mildly acidic environment.