well a fast crash is meant to react faster and reach its peak sound and then decay faster. resulting in a quick explosion of sound without having to hit overly hard. a "dark" cymbal is usually quite thin and usually has a more raw finish and have a darker drier sound.
there are a bunch of factors in what make different cymbal lines unique. a good place to find explainations is on the manufacturors websites. most have descriptions and sound samples for all cymbals they make.
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