The Phrontistery

"This list contains 168 definitions of obscure colour terms using combinations of 'normal' colours of the rainbow and descriptive adjectives; e.g. cardinal = deep scarlet red; russet = reddish brown. Note that most English speakers outside the U.S. spell colour with the added British 'u' rather than the American version color. "

 http://phrontistery.info/colours.html