Mother Of Pearl Effect
The Mother of Pearl Effect is a term used to describe a distinctive visual phenomenon observed on the surface of certain alleged UAP craft, characterized by a shimmering, iridescent color pattern that shifts and flows across the object's exterior — similar to the rainbow effect produced by gasoline on water, oil slicks, or soap bubbles.
Peru Crash Observation
The most detailed description of this effect comes from Jonathan Weygandt's testimony about the 1997 Peru UFO Crash Incident. Wagant described the crashed egg-shaped craft as purplish-green in color, with the coloration fluctuating continuously across the surface. The effect would shift from green to purple, sometimes appearing nearly silver or translucent. Wagant compared it to the rainbow sheen produced by dish detergent bubbles or the iridescent quality of gasoline on a wet surface. The effect appeared to be generated by some form of field on the craft rather than being a property of the material itself, and was observed to move around the craft's exterior.
Notably, the craft also absorbed rather than reflected direct sunlight, casting no shadow despite being illuminated — suggesting the color-shifting field may be related to the craft's interaction with electromagnetic radiation.