Traits Atlas

Codebook, Minimums, Exceptions

Fingerprint Residue

Summary: Fingerprint marks appear as the literal impression of a human touch – a latent trace left on the copper surface that later oxidized or collected residue along its ridges. The identification must be immediate and unmistakable: if one hesitates to see a fingerprint, it isn’t a Fingerprint. The CENT thereby records the act of contact, embedding touch into the material history of the coin.

Definition: A Fingerprint trait requires clear ridge patterns or loop structures that unmistakably read as fingerprint topology. Ambiguous or partial smudges are excluded. The mark may appear dark, or light depending on the residue or corrosion medium involved.

Visual Character: Fine curvilinear striations or concentric arcs, typically localized on Abe’s face or in the fields. The fingerprint may stand proud in relief (from residue) or recessed (from etching).

CENT #1929 – Fingerprint Minimum — CENT #1929 – Minimum

CENT #8400 – Fingerprint Exemplary — CENT #8400 – Exemplary

Fingerprint Variations

CENT #4231 – Partial fingerprint arc — CENT #4231

CENT #7282 – Fingerprint loop across portrait — CENT #7282

CENT #6488 – Dual fingerprints overlap — CENT #6488

Threshold and Exceptions

Meets: Immediate visual recognition of fingerprint ridge structure; clear loops or whorls.
Does not meet: Irregular marks, ambiguous residue, or partial smudges that require interpretation.
Material origin: Usually oils or acids from touch reacting with copper, producing dark oxide or light ridge mapping over time.

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