Patent No. US 6,736,860 B2: Unilever HPC, Chicago, IL, was awarded a patents for a method to permanently dyeing hair that comprises subjecting the hair to a number of treatments and rinses, with a set time interval between each two consecutive treatments. The treatment comprises a mixture of dye intermediates in water and fatty alcohol at alkaline pH and an oxidizing compound in water and fatty alcohol with an acidic pH.
Unilever Patents Gradual Hair Dyeing Process
Published November 15, 2005
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