Method of assessing hair colour changes
US10444157B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2014 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Apr 27, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a method of assessing the potential color protecting effect in vivo of a test formulation such as rinse-off hair treatment formulation, the method comprising the steps of: providing a sample of the test formulation to be assessed; providing a model substrate in the form of a hair switch which has been artificially colored; applying the test formulation to the hair switch; subsequently rinsing the test formulation from the hair switch; collecting the rinse liquor and analysing it for the presence of eluted color; characterized in that the artificial color used to color the hair switch is a permanent hair colorant with a shade level 1 or 2 according to the International Color Chart (I.C.C.). The method provides improved sensitivity and differentiation, and enables the tester to compare different technologies in terms of effectiveness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.