These dyes don't last forever, but while they do last they're absolutely gorgeous. The Blue Envy/Pure Sapphire were the second dyes I used from Splat, the first being the Raspberry red. The colour is super great and fades beautifully. It lasted me a few months before I had to dye it again and that was with me washing my hair every other day. It dried out my hair a bit, but with a good leave in gel it went away in a few days. The first time I ever dyed my hair it was with Luscious Raspberry. I wanted it to be red, but they were out in the store and so this weird, pinkish red colour it was. This stuff lasted for months! I redyed it twice, throughout the course of 3 years then let it fade out. This stuff fades to a super ugly copper/orange. The Raspberry colour is super vibrant and gorgeous, though. The last time I used splat I dyed my hair using the Jet Black. This stuff fades super quickly! Within less than a week the colour was already gone from my hair. After the black I just let my hair fade into my regular colour. Other than drying out your hair, this stuff works pretty well.