Iridescent (No.2) Powder is just one of the high-performance and light fast special effects pigment powders, which compliment A J Ludlow's Professional Watercolour range.
Special effects pigment powder Iridescent (2) is an interference pigment, which changes colour depending on the viewing angle. This particular pigment offers colour graduations that flow in and out of each other in a multitude of shades depending on the viewing angle and the incidence of light.
The colour shift (or colour "flop") of Iridescent (2) is shown to its best advantage over dark backgrounds; going from green to violet.