| 摘要 |
The invention also relates to a method for maintaining the colour of dyed keratin fibres in which prior to dyeing the hair and/or highlighting, a specific prtreatment agent is applied to the keratin fibres. The invention also relates to an acidic pretreatment agent for hair, which contains alum and a silicon, and to the use of the cosmetic agent for maintaining the colour of hair, in particular reducing colour shift, of dyed keratin fibres. |
