hi ...colorist pls help.. THere is a formula to calculate e level u wan to lift.
EG: Desired color = lvl 7
Natural color = lvl 4
So to know what color u need to use ., First , mutiply e DEsired color lvl 7 Which is 7 times 2 = 14.
After which , use 14 to subtract e natural color which is 4 n u get 10 .
SO to lift from a lvl 4 to lvl 7 , u must use a LVL 10 color .. IS this true ? Someone pls help