This colour must be mixed with developer - the dedicated Wella Color Charm 20 Vol Developer is recommended.
Always mix Wella Color Charm Permanent Hair Colour in a 1:2 mixing ratio. This means you need twice the amount of developer to colour.
One 107ml bottle of Developer is enough for one bottle of 42ml Permanent Colour.
Apply the Permanent Colour to dry hair and allow to develop for 30 minutes or up to 45 minutes for additional depth or grey coverage.
I really like this colour- I have been trying other brands to get rid of the warm gold, to a medium ash blonde & at last this one has been successful.
For a dark shade of ash blond this is simply the best