Traits Atlas

Codebook, Minimums, Exceptions

Orange Patina

Summary: A warm orange surface phase that sits between raw copper brightness and deeper reds. It reads as luminous and energetic.

Color: Tangerine, copper-orange, and amber/ochre; highlights can stay bright while open fields shift toward uniform orange with subtle interference. Recesses may deepen toward sienna.

Chemistry: Typically thin cuprite (Cu₂O) films over metallic copper producing orange hues by optical effects; trace oxides/carbonates can push the tone toward amber or sienna. Often a transitional stage before redder patinas.

Classification: Orange is a sharpened trait category. We don’t use a „notable” and „full” designation for Orange; instead, the trait is reserved for clear standout examples that present a signature orange read. Borderline or orange-leaning Cents are intentionally excluded.

Standout Examples

Cent #3581 – Orange Patina standout example — Cent #3581 – Orange Standout

Cent #1377 – Orange Patina standout example — Cent #1377 – Orange Standout

Selection Standard

Coherent orange read: Orange must register clearly as the dominant surface phase, not just a warm cast.
Continuity: The orange effect should form continuous regions or a unified film logic (not scattered “islands” or mixed-field ambiguity).
Exclusion of overlaps: If the coin reads primarily as Red, Gold/Desert, or “orange-leaning” within another patina, it is left out of Orange.

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