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Chinese Firm Patents Hair Coloring Products



Published February 13, 2013
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• US Patent No. 8,313,537 B2; Natural Medicine Institute of Zhejiang Yangsheng-tang Co. Ltd., Zhejiang China, has been awarded a US patent for a mordant useful in a hair dye product. It is comprised of an effective amount of a ferrous salt and an antioxidant, according to the patent literature.


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