10/4 in Igora is a hi-lift so it won't cover. If you are looking to tone down the bleach then you would be using your 9.5 range with 3%. What colour on the shade chart are you looking to achieve?
Thanks for quick reply she wants the light blonde and dark blonde look all i have in is igora 9-4 we are trying to avoid bleach but have decided on 9-4 with 6% a dark blonde alternate foils and at the end go through the parting line with bleach with 3% ....ahhh i dislike white and grey hair
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