Crazy Colour Black 100ml size. Black, does exactly what it says on the tin. A great choice when you want to change your colour without using a permanent dye. Crazy Color Black is great for those times when you fancy a change, but is a lot easier to get back to vibrant colours if you feel like it. Black can also be a great colour to use alongside other bright and vivid dyes, it just goes with everything! Be warned though, if applied straight to bleached hair black can go a greenish colour, best to put this one on top of an existing colour. For natural hair this is one of the best colours for a result.