Catalysing dye molecules

It is not essential for dye molecules and textile substrates to possess identical properties to bond effectively. When these characteristics differ, a catalyst is needed to assist the dyeing procedure on the cloth, a function performed by salt. Due to its significant attraction to water, salt serves three primary purposes: it forces the pigment into the fabric, ensures the highest possible level of dye depletion during the procedure, and acts as an electrolyte to manage the movement, absorption, and bonding of colorants to cellulosic substances. Essentially, salt draws the dyes toward the threads prior to their lasting attachment via alkali treatment.

In reactive dyeing, salts are vital for increasing the pigment's attraction to the fiber, speeding up their connection, and reducing the dye's solubility. Generally, vacuum salt, common salt, or common salt are employed for this task. However, when producing royal blue or turquoise tints, common salt is required as the electrolyte. Because the chlorine ions found in common salt can lead to machinery erosion, common salt is typically the favored option. Known scientifically as sodium sulfate decahydrate, Salt appears as colorless or white monoclinic crystals. It turns into a dry sodium sulfate powder when it loses moisture in arid air. Originally manufactured by Johann Glauber from Hungarian spring water, this water-soluble substance has a sharp, bitter flavor. Beyond its extensive application in the coloring industry, it is occasionally utilized medicinally as a gentle laxative. Meanwhile, sodium chloride (NaCl) is the standard designation for common salt.