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1. (WO2003075870) GRADUAL PERMANENT COLOURING OF HAIR USING DYE INTERMEDIATES DISSOLVED IN ALKALINE AQUEOUS MEDIUM COMPRISING A GELLING AGENT

Pub. No.:    WO/2003/075870    International Application No.:    PCT/EP2003/002002
Publication Date: Sep 18, 2003 International Filing Date: Feb 26, 2003
IPC: A61K 8/81
A61Q 5/10
Applicants: UNILEVER PLC
UNILEVER NV
HINDUSTAN LEVER LIMITED
Inventors: PATEL, Jitendra
JONES, Frank
Title: GRADUAL PERMANENT COLOURING OF HAIR USING DYE INTERMEDIATES DISSOLVED IN ALKALINE AQUEOUS MEDIUM COMPRISING A GELLING AGENT
Abstract:
A method for permanently dyeing hair which comprises subjecting said hair to a number of treatments, having a set time interval between each two consecutive such treatments, wherein each treatment comprises steps a.) and b.) below:a.) contacting said hair, for a period of about 5 seconds to about 5 minutes with a recently made mixture of:part ai: dye intermediates in water with a gelling agent at alkaline pH part aii an oxidizing compound such as hydrogen peroxide in water at acidic pH ;b.) rinsing said mixture from said hair with water;and wherein said number of treatments is between about 2 to about 30; and wherein said set time interval between each two consecutive treatments is between about 8 hours and 30 days.