Iridize refers to the process of producing rainbow-like colors on the surface of an object. Synonyms for the word iridize include pearlescence, opalescence, prismatic, rainbow-like, and kaleidoscopic. These words evoke the same shimmering effect that iridize does. They are commonly used in the description of colored metals such as gold, silver, and titanium. Pearlescence and opalescence are used to describe the milky, iridescent quality of a surface. Prismatic and kaleidoscopic evoke visions of multiple colors and light reflecting in various directions. These synonyms offer more ways to describe the unique visual effects of iridescence.