I used the rouge about 3 months ago on my shoulder length hair.
I used 2/3 of the bar and grated it finely - this bit took the longest. This is to make mixing and melting easier.
Use gloves and cover everything!
It is very messy to apply but as I did it over the bath I was relieved at how easy it cleaned. (I did it straight away)
After coating and smothering my hair in the earthy smelling mixture I clingfilmed and scarfed my hair and left in on all day.
Washing it out was easy enough, again in the bath, took a while though.
My hair felt amazing and turned from a dark brown into a lovely red with some streaks of flame orange where I have natural blond bits.
The colour has held well and is just fading now, the one thing I didn't like was the earthy smell I got every time I washed my hair for a while, but apparently that's pretty normal with Henna.
I prefer to the usual chemical dyes, and it isn't hard to use, just messy and time-consuming.