T-Shirt Times

okay .. for months and months (proberley about a year) ive been trying to go blonde at the hairdressers (im naturally brunette) and they have been giving me highlights each time.. but its taking too long and im not happy with the result each time.. even though it got me blonde iwasnt happy with the colour. i finally went to the shop and brought some loreal light blonde hair dye it went a light blonde and im happier then ive been at the hairdressers but ive brought an xxl schwarzkopf platnuim blonde hair dye and wondering if using this ontop of the other colours( including bleach) would turn it green as it contains peroxide?.... i know how much im damaging my hair thats why i just want to get the colour im happy with and jus worry about my roots.. any advice? thankyou x