Bleaching is the process of whitening materials by sunlight, ultraviolet radiation, or chemicals that reduce or oxidize dyes into a colorless form. Hydrogen peroxide is used to bleach wool, silk, and cotton; hypochlorites, including bleaching powder, are used for cotton; and sodium chlorite for synthetic fibers. Sulfur dioxide bleaches are impermanent. Careful control of pH is essential.
Related category INDUSTRIAL CHEMISTRY
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