Acidic post-treatment of hair dyed with dihydroxyindole
AssigneeBristol-Myers Squibb Company
InventorLeszek Wolfram
Life of this patent
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Abstract
A process for altering the color of hair that has been dyed with dihydroxyindole comprising the steps of treating the dyed hair with an acidic solution for an effective amount of time and rinsing the treated hair.
Claims10
A process for lightening the color of hair previously dyed to a gray to black coloration with dihydroxyindole, the process comprising the steps of applying an aqueous, acidic composition having a pH of about 2 to about 7 to the hair, the composition consisting essentially of an acid component with the proviso that the acid component is not periodic acid, the acid component being the sole color modifier in said composition and said composition being applied to the hair for a period of time effective to increase the Hunter L value of the dyed hair by 2.5 or more units, and rinsing the hair.
Dependencies are inferred from the claim text.