Hi, if you want to be cooler base 4,
you could ask your hairdresser to use a semi demi permanent quasi
eg.. Wella Colour fresh in a cool base 4 or even a natural base 4
with 1.9%
but depending on grab ask her to do test pieces first
also by using a much lower peroxide with a cooler base , it will kill any red tones without needlessly lifting it anymore
The peroxide strength could be the main problem ,
because the higher the peroxide strength more the natural red pigment will be drawn out
The result will depend on what you have previously put on your hair ,
so do ask your hairdresser for test pieces so you can see the actual colour it will turn out first , then she can tweak it a bit for you to the exact colour you want , so there's no guesswork involved
and definitely no bleach or it will turn orange
hth x minky