Depends which range you use. Most of the big companies run courses which they claim are almost a degree in colour. Kimmi 1101 in here has done the wella one I believe. I've done Redken. I know l'Oreal run one too.
Pick a manufacturer then invest in their schemes, I've done 3 brands and 2 different master programmes. It's all useful in long run but best to go with one company to start
Im doing my Schwarzkopf Royal masters this year, its not cheap, takes around 6 months but can't wait! you do however need a bit time under your belt to do this one. I'm in my 6th year of using Schwarzkopf.
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