My sister has blonde highlights and 80% grey. She now wants to go brown. If I were to mix xp100 5.75 (light heather brown)with xp100 5.003 (warm light brown) using 50/50 of each using 20% peroxide with half inch red (or do I even need to add this red), would this work without going green. Want a nice warm brown (not reddy)...any advice would be much appreciated...thanks
PS if you unaware xp100 equivalent to loreal
PS if you unaware xp100 equivalent to loreal