 Neither does the rule apply to the tongue, horns, claws, hoofs of beasts (for instance, a lion Or on an azure field could be "langued" [with his tongue] gules) when of a different tincture than the rest of the animal, or other parts of charges that are "attached" to them; for instance, a ship sable on an Or field may have argent sails as the sails are considered to be attached on the ship rather than charged on the field.One important distinction, according to Fox-Davies, is that the rule of tincture also does not apply to crests or supporters, except in such cases as the crest or supporter itself is treated as a field and "charged with" one or more objects.For instance, a gold collar about the neck of an argent supporter is common, but if eagle wings are used as a crest and charged with a trefoil (such as the coat of arms of Brandenburg), the trefoil must conform to the rule of tincture.