Inks that contain metallic powders mixed with the ink base; powders are flakes that are deposited in reflective layers.
Gold and silver semi-reflective inks used for special effects in print design. In most cases should be printed on coated gloss art stock or high gloss cast coated otherwise the ink is absorbed into the stock leaving a dull lustre finish.
Inks in which the normal pigments are replaced by very fine metallic particles, typically, gold or silver in colour.