Two-stage process for dyeing keratin fibres
US4425132A · kind A · utility
68Cited by
2References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1979 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Apr 5, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/88
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A two-stage process for dyeing keratin fibres, especially human hair, is described which involves treating the fibres with a first composition at a first pH and subsequently, without rinsing treating the fibres with a second composition at a second pH, at least one of the compositions containing a dyestuff for the fibres, and the second pH being different from the first pH so as to modify the effect of at least one active ingredient on the fibres.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.