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 have never used a separate colour and developer before. I had gone from blonde highlights to a light brown (with the goal to keep it an ashy light brown - it's a process!) a few months ago. I still have some orange/reddish tones left over of course from going blonde to brown. This colour has toned down my reddish tones, left my hair feeling healthy, and covered my greys very well! I haven't gone too dark, I highly recommend Fanola No Orange Mask as well!!!