Method of effecting a reversible color change of dyed hair
US7198651B2 · kind B2 · utility
6Cited by
1References
15Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 26, 2004 |
| Grant date | Apr 3, 2007 |
| Priority date | — |
| Expiry date | Oct 13, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention relates to a method to achieve a reversible change of the colour of hair dyed with an azo dye wherein the change of the colour can be effected by, for example, the salonist or the consumer in a simple manner.The colour of the hair thus dyed may be changed simply by treating the dyed hair with an acid treatment composition at any time after the first dyeing treatment. If desired by the consumer, the colour may be returned to substantially the original post dye colour by treating the hair further with an alkaline treatment composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.