| 摘要 |
<p>Additive suppressing oxidation of the dye during the addition of the oxidising agent, and even during the application onto the hair, is of formula: (where R1 is COOH, COOR3, CN or SO2NR3R4, in which R3 and R4 are each H or 1-4C alkyl, an alkyl or alkoxy gp with 1-4C or halogen and R2 is COOH, COOR5, in which R5 is 1-4C alkyl, NO2, an alkyl or alkoxy gp with 1-4C, halogen, or H). The dyeing is carried out at 10-40 degrees C and uniform intense colouration is achieved.</p> |
