This was given to me by my hairdresser, to help reduce the amount of washes my hair was getting. I have crazy fun coloured hair (aquamarine currently) so getting the most out of each colour is vital!!
I am not a fan. At all. I followed all the directions and it just didn't give me the results I wanted. Hair still looked in need of a wash, rather than letting me have that extra day... and my dark roots ended up looking grey, even though I only used it sparingly!