Traits Atlas
Codebook, Minimums, Exceptions
Iridescent Patina
Summary: The Iridescent trait is defined by a dominant copper toning overlaid with a shifting play of colors – yellow to gold, violet, and obsidian blue. The surface appears to refract light rather than simply reflect it, as if a thin interference film has developed atop the metal. The effect transforms oxidation into spectacle: color emerging from corrosion.
Definition: Qualifies when an otherwise copper-toned CENT shows clear iridescent overlays, often in streaks or zones where the surface has oxidized into a thin-film spectrum. The hues may range from warm gold and amber to blue, purple, or greenish undertones, but the copper field remains legible beneath.
Material Character: The phenomenon likely results from ultra-thin oxide films or micro-contaminants that create interference effects at the copper surface. These act like natural diffraction layers, producing variable coloration depending on film thickness and viewing angle. The underlying copper toning anchors the spectrum – its reddish warmth mediates the cooler blue and golden streaks, generating a subtle internal glow rather than overt shine.
Iridescent Variations
Notes
- Optical effect: The iridescence arises from light interference within thin oxide layers, producing wavelength-dependent color shifts.
- Visual hallmark: The interplay between luminous streaks and the copper base is essential – the reddish substrate gives the trait its characteristic warmth and internal depth.
- Classification: Though technically a form of patina, Iridescent is recognized separately for its spectral behavior and aesthetic rarity.
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