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Hair PreparationsVERSENE* chelating agent at 0.1 to 0.3% concentration in alkaline sulfite preparations stabilizes the formulations against air oxidation catalyzed by copper, manganese, and other metals. VERSENE chelating agents also help prevent precipitation of sulfites in hard water areas. VERSENE chelating agent (0.2 to 0.5% based on dye concentration) is used to protect against precipitation, color change, and rub-off caused by calcium, copper and iron. In hard water areas, a water solution containing 1% of VERSENE chelating agent is an effective rinse for removing insoluble calcium and magnesium soaps. A similar rinse may also be used prior to cold waving or coloring. Dow Chelating Agents for Hair Preparations
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