Clearly many people view the colour sheet provided as a list of colour options you will get no matter what colour you start with, no matter which developer you use. That's not how it works. You first need to know what level (darkness) your hair is, the colour required by each toner for it to work, and then the strength developer (a chart is provided in the instruction sheet).Many people here have put random toners on their hair which will not work and was not meant to work for them, YOUR HAIR MUST BE THE RIGHT LEVEL TO START. If you put a dark toner on very light hair, expect to dye your hair the colour of the toner, which likely won't match the result as these work through colour correction (ie purple and yellow makes white, purple and nearly white makes purple, same with the blue toners for orange hair, dont put it on hair that isnt orange!). If you put a toner meant for very light results on a darker blonde base or even brunette, expect to see orange results or maybe even no results, some of these toners will have no result unless you have a pale yellow base.Toning your hair isn't like dying your hair, you need to understand the colour correction you're doing before choosing what toner to get, you also need to have already lightened your hair to know if you're going to end up orange, yellow or pale yellow before buying one.I had incredibly pale yellow hair and wanted white, so I used a superlightener which does not contain colour so would not accidentally dye my hair, but does have anti yellow properties to help me achieve white. I chose ML.00 and got exactly the colour it says. This lightener would not have worked on hair that is brighter yellow (maybe with a strong developer) as well and probably not at all on orange hair.This product does work, if you know how to use it and pick the right one with the right developer.