Ladies, do not buy it.
"Brightens hair after 2 shampoos a week"
"takes away brassiness"
Don't you ruddy believe it.
It makes you look like you have had a purple rinse, a la Dallas etc.
It's OK if you wash it out straightaway like any other shampoo, then use a conditioner and wash out. Mind the mess round the bath though and don't use a white towel !