Hi I don't mean to be rude but there's things I feel I should point out within your post
QUOTE=snaz;1582768]Just been a on wella course and you do not need to add base in with the colour for better coverage, All of there shades cover 100%.
If this was the case then the op wouldn't have asked the question, as the 6/3 she used didn't cover her clients grey 100%
Leave the colour on upto 1 hr and see if that makes a difference,
Wella colours STOP working after 45mins so not sure leaving it on for a hour would make any difference
and make sure that you are mixing it correctly ie measuring it, and use plenty of colour, I.e 3/4 of a tube or more.
I agree with mixing and measuring correctly but it depends on whether she was colouring regrowth roots or full head as to what amount she would use 30ml (half a tube) is sufficient for a regrowth application
Now if she as resistant grey use the double base 66/0 which cannot be mixed with other shades, but u can mix this with special mix so you can mix this with /33 generally you would mix 5cm with base 6, but has I've not tried it not sure how warm this would be. But take into account clients under tones , which will be orange so a 66/0 will be warm has the client natural undertone will be revealed and if she wants more warmth gold has said above add special mix.
