Lustre
The designation of Gray's lustre colours is not an exact science. Gold is used in most lustre mixes in combination with other metals, organic oils and resins, resulting in a wide range of colour. The effects produced can be described as bronze, gold, copper, purple or pink. The colour can also be modified by the addition of an all-over transparent lustre, called mother-of-pearl, and which produces an iridescent effect.
