 In practice, however, fields divided into multiple partitions, such as barry or checky, use (with extremely rare exceptions) an alternating pattern of metal and colour for adjacent units.The rule also does not apply to charges placed upon party-coloured (divided) or patterned fields; a field party or patterned of a colour and metal may have a charge of either colour, metal, or party or patterned, placed on it (and there is a small body of precedent that a field party of two colours or two metals may have a charge or charges of either colour, metal, or party or patterned on it; examples of this certainly exist).Likewise, a party-coloured (of colour and metal) charge may be placed on either a colour or metal background.