27 vol developer

Our 27 vol developer is specifically formulated to cover colour-resistant greys. It can also be used to lift up to three colour levels from your natural base colour by extending the processing time.

Greys can resist colouring because along with the loss of natural pigmentation the hair undergoes structural changes. The outer cortex layer of greys can be more tightly packed and layered, making it harder for the colour to penetrate to be deposited within the hair. A standard 20 vol developer can not always achieve full colour coverage over colour-resistant greys. A developer which is 30 vol or higher will damage the hair. 27 vol developer has a bit more lifting power than the 20 vol developer and it will give complete colour coverage over stubborn greys.

If you are looking to lighten your colour level, extending the processing time will help you achieve up to three levels of lift.