Glitter is an optical pigment with dynamic color change function, which is composed of micro-nano structure metal coating (such as aluminum). Its core feature is angular color change - it presents a rainbow-like halo at different observation angles, and produces a clear rainbow ring effect when focusing light. Common shapes include quadrilateral, hexagon, circle or silk strip. Glitter has become a star material in the beauty industry and industrial design due to its dynamic color change and high glitter characteristics.