Shiseido patents oxidation hair dye

Shiseido Company, Ltd., Chuo-ku, Tokyo, has patented an hair dye composition consisting of a first formulation containing an oxidation dye and a second formulation containing an oxidation agent, which is the composition of two formulations that are mixed before use (US Patent No. 8,657,888 B2). 

The first formulation and/or the second formulation contains acetylated hyaluronic acid or salts thereof and the pH of a mixture of the first formulation and the second formulation in the same weight is 8 to 9.