You have to mix up the powder bleach/colour with the cream peroxide and leave for five minutes, then paint each strip of hair with the colout and wrap in foil strips (provided). Heat with a hairdryer for 5 minutes and then leave to develop. So it's a bit of a faff. In fact it made less mess than I normally do with all-over-head dye though. I should have done a strand test probably, but just opted to go for the longer end of the time range for dark hair. It's come out rather bright pink rather than purple, and I've rather missed the roots, but overall I rather like the effect.
There was enough dye to do a lot more hair than I did, and I reckon it would work better on longer hair. Nice one anyway.
In other reviews Tesco Value mushy peas are better than their ordinary ones, cos they're more like proper muchy peas instead of just slightly squished marrowfat ones. Have yet to find anything properly close to the real thing from a tin.