Daniel Smith Luminescent watercolours, unlike anything ever seen in watercolour, simulate the glitter of a watery surface or the lustre of mother-of-pearl. They're made from mica pigment, thin transparent particles coated with highly reflective metal oxides. Iridescent colours reflect light and their semi-transparent quality adds a fascinating sense of depth to your work. Iridescent Topaz is a pale yellow-gold with just the slightest hint of a green undertone.