Process and kit for dyeing hair with catechols and a...

Details Process and kit for dyeing hair with catechols and a... Process and kit for dyeing hair with catechols and a...

A - Human Necessities

61

K

A61K 7/13 (1990.01)

Patent

CA 2138570

A method of permanently coloring hair comprises applying to the hair, hair dye composition which comprises a tinctorially effective amount of at least one catechol, a persulfate oxidizing agent which is present in the composition in an amount equal to about one to four equivalents relative to the catechol and sufficient buffering agent to provide a composition having a pH of from about 7 to 11. The buffering agent is selected from the group consisting of TRIS and bicarbonate which allows the composition to remain in contact with the hair for a period of time sufficient to achieve a desired color.

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