A pearlizing agent is a substance added to cosmetic or paint formulations to create a luminous, pearly effect. When coated onto a surface, pearlizing agents reflect and diffuse light in a way that mimics the iridescent shine of mother-of-pearl or pearls. They add a subtle luminous sheen without altering the base color. https://timessquarereporter.com/business/the-beauty-of-mother-of-pearl--a-closer-look-at-pearlizing-agents