Lowlights that don't fade within 3 weeks? Anyone found the best for staying power?

[TracyK]

I have my hair high and lowlighted every 6 or 7 weeks. But I think I must have very porous hair - my lowlights turn a light honey colour within 3 weeks (rather than the chocolate they are sposed to be!) She does try and do dark over dark and light over light each time (obv. not 100% - but near enough)

I get the majirel colours put in - are there any others out there that have more grab on your hair?

i use koleston (wella) and they seem to last well. Never really used l'oreal colours to be honest so can't compare.

Is that at the hairdressers or yourself?