Process for dyeing hair in which the depth of shade is gradually increased in successive treatments
US4104021A · kind A · utility
18Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Apr 20, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Human air is dyed in successive treatments at selected intervals with oxidation colors (aromatic primary amines and aminophenols) admixed in each treatment with an oxidizing agent (H.sub.2 O.sub.2 or a derivative thereof) -- the quantity of oxidation colorant applied in each treatment being substantially the same and the quantity of oxidizing agent being increased from the first to the last treatment to effect a gradual increase in depth of shade -- the mixture being allowed to remain on the hair for substantially the same tine in each treatment, followed by removal by rinsing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.