Shimmering Red Iridescent paint is used on most fish that have begun to spawn. The shimmering colours of the Polytranspar™ Iridescent waterbase airbrush paint can generally be seen from only one angle and are nearly invisible when looking at them head-on. As the viewer or light source moves, the iridescent pigments reflect different colours, producing a nice shimmering effect. Only a very small amount of paint is needed for the effect. Almost all fish exhibit some combination of iridescent colours.