Schwarzkopf BlondMe Bond Enforcing Premium Lightener 9+ is a powder lightener with the unrivaled performance that's able to lift both natural and colored hair up to 9 levels. What it does: It offers perfect neutralization, thanks to its anti-yellow agents which directly target the hair pigment that causes those warm yellow undertones. What else you need to know: It has a flexible mixing ratio (between 1:1.5 and 1:2.5), which means you can mix it to the consistency that works best for you and should be mixed with BLONDME Premium Care Developer for optimum bleaching and hair care.