| abstract |
The invention relates to an agent for dyeing keratinous fibres, especially human hair, containing pyrazolidine-3,5-dione and/or specific pyrazolidine-3,5-dione derivatives, in combination with at least one aromatic aldehyde. The invention also relates to the use of said combination in agents for dyeing keratinous fibres, for brightening the colour of already dyed keratinous fibres or tinting the same, and to a method for dyeing keratinous fibres, especially human hair. |