I bought a box of four tubs of this hair dye on ebay from a U.K seller. I had read many reviews online prior to buying it. I bought the dye in Silver. The directions say to wash your hair and towel dry and then put the dye all over your hair and leave on for 25 mins. The first time I tried it, I didn't wash my hair and found that the product didn't really do much of anything to my hair, and my hair was super white prior to trying to dye it.
The second time however, I washed my hair and towel dried it. I then used one and a half tubs of the dye (the tubs I got are a little smaller than a tub of manic panic). I left it on for over an hour, with plastic wrap on my hair and a hat.
After washing it out, first I noticed that it did condition my hair really nicely! Secondly, it turned my hair a sort of super light blueish silver. Very pretty.
It didn't colour every single strand of my hair (like most semi permanent dyes), but it did look very pretty. It fades pretty quickly, so I don't wash my hair more than three times a week.