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Hair Dye with Aromatic Amines from LOral

Published November 15, 2005
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Patent No. US 6,679,923 B2: L’Oréal SA, Paris, France, was granted a patent for a hair dye comprising at least one pyrazoline-4,5-dione or a cosmetically acceptable salt and at least one aromatic or heteroaromatic amine of formula or a cosmetically acceptable salt.

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