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You need to use richesse developer maybe 9vol not 20 vol (that's to use on permanent colour )

Ok you would usually use corresponding base so cool colour natural basrvwarm colour warm base so in 420 use 4 say in a copper tone use .3 base hope this helps

Forgive me for sounding rude but are you a hairdresser or just new to L'Oréal?

No if the numbers have a red box around you don't need base , if the numbers red with no box around you do add base

You can use on grey hair too , if there is a red box around number on colour chart you don't need base added

Hi yes you can use it on its own What's her natural base

Hi you didn't say what kind of purple ? 5.20 is lovely also yes you can use mix tones over bleach

Hi you could colour match ie add 3/6 cm of your prebase colour to your target colour and apply as normal or you could use richesse but choose a slightly lighter shade as it's gonna be on longer than process time hope this helps