The other responses seem to focus on more interesting colors. I'll agree Manic Panic is great though for me most colors were more temporary than they were for other people I knew. My hair takes a long time to dye thoroughly, though, about twice as long as is normal for medium to dark brown hair like mine with similar texture. It's an annoying oddity. Bleaching it first of course has MUCH different and dramatic results.
That said, Natural Instincts hair dyes, which I love the feel of, have a "28 shampoos" temporary black that I have been trying to wash out since March. Friends warned me but I didn't listen. Beware any black dye that claims to be temporary. It is rarely true and the color may last as long as the hair is attached to your head. Mine has faded but is still at least 3 shades darker than my natural color. I'd call it espresso or very-dark-walnut rather than black, but still.
Red hennas may also work for temporary color - they usually fade over time - but black hennas will dye your hair a more permanent or semi-permanent color.
what color and how long do you want it?
That said, Natural Instincts hair dyes, which I love the feel of, have a "28 shampoos" temporary black that I have been trying to wash out since March. Friends warned me but I didn't listen. Beware any black dye that claims to be temporary. It is rarely true and the color may last as long as the hair is attached to your head. Mine has faded but is still at least 3 shades darker than my natural color. I'd call it espresso or very-dark-walnut rather than black, but still.
Red hennas may also work for temporary color - they usually fade over time - but black hennas will dye your hair a more permanent or semi-permanent color.