MAPEI Flexcolor® 3D is a professional-grade, ready-to-use (RTU) translucent specialty  grout with an “iridescent effect” finish. It is offered in 10 designer colors with translucent  characteristics that not only reflect but also refract light. This allows the grout to transition in color to complement the tile color. The “translucent effect” is most noticeable with the color Crystal Moon (#5201), while the other nine colors exhibit a more pronounced “iridescent effect.”