Decolorization of Chromium and Dyeing Spots on Leather by Bleaching Agents

Decolorization was carried out on the leathers with chromium and dyeing spots by different bleaching agents for valorization of defected products. Sodium perborate, sodium percarbonate, hydrogen peroxide, oxalic acid and sodium thiosulfate were used as bleaching agents. Sodium perborate was used by itself and together with other bleaching agents as combined. Color difference on leathers was spectrophotometrically measured by Konica Minolta CM-3600d apparatus. Leathers were re-processed after the bleaching and bleaching process was examined in terms of the strength properties of leather. Sodium perborate provided the best bleach and did not negatively affect the physical properties of leather.