i.e. the colour of the field if it be of colour, or if it is of metal, then the colour of the principal ordinary or charge upon the shield. The metal will be as the field, if the field is of metal, or if not, it will be as the metal of the principal ordinary or charge. In other words, it should be the same tinctures as the wreath.
If the field is party of colour and metal (i.e. per pale barry, quarterly, &c.), then that colour and that metal are "the livery colours." If the field is party of two colours the principal colour (i.e. the one first mentioned in the blazon) is taken as the colour and the other is ignored. The mantling is not made party to agree with the field in British heraldry, as would be the case in Germany. If the field is of a fur, then the dominant metal or colour of the fur is taken as one component part of the "livery colours," the other metal or colour required being taken from the next most important tincture of the field. For example, "ermine, a fess gules" has a mantling of gules and argent, whilst "or, a chevron ermines" would need a mantling of sable and or. The mantling for "azure, a lion rampant erminois" would be azure and or. But in a coat showing fur, metal, and colour, sometimes the fur is ignored. A field of vair has a mantling argent and azure, but if the charge be vair the field will supply the one, i.e. either colour or metal, whilst the vair supplies whichever is lacking. Except in the cases of Scotsmen who are peers and of the Sovereign and Prince of Wales, no fur is ever used nowadays in Great Britain for a mantling.
In cases where the principal charge is "proper," a certain discretion must be used. Usually the heraldic colour to which the charge approximates is used. For example, "argent, issuing from a mount in base a tree proper," &c., would have a mantling vert and argent. The arms "or, three Cornish choughs proper," or "argent, three negroes' heads couped proper," would have mantlings respectively sable and or and sable and argent. Occasionally one comes across a coat which supplies an "impossible" mantling, or which does not supply one at all. Such a coat would be "per bend sinister ermine and erminois, a lion rampant counterchanged." Here there is no colour at all, so the mantling would be gules and argent. "Argent, three stags trippant proper" would have a mantling gules and argent. A coat of arms with a landscape field would also probably be supplied (in default of a chief, e.g. supplying other colours and tinctures) with a mantling gules and argent. It is quite permissible to "vein" a mantling with gold lines, this being always done in official paintings.
In English official heraldry, where, no matter how great the number of crests, one helmet only is painted, it naturally follows that one mantling only can be depicted. This is always taken from the livery colours of the chief (i.e. the first) quartering or sub-quartering.
