Hydrogen peroxide color removal processes

Lightening or removal of hair color without structurally damaging the hair shaft is a difficult process. Oxidizing agents, including hydrogen peroxide,... 

Color bodies may be metal ions or organics. Treatment with adsorbents is a conventional process, and Mannig and Scherer [151] describe the use of hydrogen peroxide as a decolorizing agent. Metal ions can also be removed electrochemically. 

Subsequently some residual chemical oxygen demand and aU the color could be removed from the coagulation-treated effluent by a Fenton process. Fenton s reagent is a solution of hydrogen peroxide and an iron catalyst that is used to oxidize the contaminants or wastewater (36). The iron ions catalyze the oxidation as ... 

After fabric or yam bleaching, residues of hydrogen peroxide are left in the bath and need to be completely removed prior to the dyeing process, using a step called bleach cleanup. Incomplete peroxide removal results in poor dyeing with distinct change of color shade and intensity, as well as patchy, inconsistent dye distribution. 

Semipermanent dyes refer to formulations that dye the hair without the use of hydrogen peroxide to a color that only persists for 4-6 shampooings. The objective of temporary hair dyes or color rinses is to provide color that is removed after the first shampooing process. 

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