Seedlabs

TrueCore: Eddy-Current Counterfeit Screening for Bullion and Coins

A device that uses electrical currents to detect if gold or silver coins have a fake core inside.

A benchtop reader that screens gold, silver, and platinum pieces for counterfeit substitutes (tungsten cores, brass, steel backs) in seconds without sampling or surface-only readings, using an eddy-current antenna tuned — via the modeling approach of the source paper — to the signature gap between genuine and fake metals.

EngineeringNon-Destructive Testing Techniques
Urban Stormwater and Fluid ManagementPrecious metals retail — bullion and coin authentication at intake

Concept

A countertop verifier for bullion dealers, pawn shops, and coin grading services. Place a coin or small bar on the reader; a tuned eddy-current antenna reads the piece's conductivity and magnetic signature within the field's reach and reports 'consistent with' the expected precious metal or 'anomalous — investigate'. The wedge: handheld XRF reads surface composition and can miss a dense substitute under a genuine metal shell, fire assay is destructive, and weight/measure checks only catch crude fakes. An eddy-current signature check is fast, non-destructive, and needs no consumables. The product is deliberately a screening step in front of XRF — limited to consistency calls on standard bullion alloys and known counterfeit substitutes — not a full assay. The antenna construction and parameter modeling from the source paper is what allows the probe to be tuned for this specific discrimination task rather than serving as a generic conductivity meter.

Why now

The source paper [0] establishes the eddy-current method as a recognized route for identifying metals and shows that the antenna — the element that sets field penetration and how cleanly two metals' responses separate — can be constructed and its parameters modeled. Distinguishing genuine precious metals from substitutes is precisely a metal-identification problem, and a modeled, tunable antenna is what lets the reader be optimized for the signature gap between, for example, gold and tungsten-based fakes instead of being an off-the-shelf generic sensor.

Written by GLM · 11 Oct 2026

AI assessment

Backed by 1 paper81

A focused, high-utility application of eddy-current sensing that solves a specific, high-value pain point in the precious metals market with a clear technical wedge.

Evidence strength
3/5
The source paper confirms the general feasibility of using modeled eddy-current antennas for metal identification, though it doesn't specifically test gold-tungsten pairs.
Market pull
5/5
Bullion dealers and coin graders face a constant, high-stakes threat from sophisticated fakes, creating urgent demand for non-destructive, fast screening.
Novelty & moat
3/5
While it uses the same physics as AlloySnap, it targets a completely different user base and a much higher-value discrimination task (precious metals vs. tungsten).
Feasibility
4/5
The hardware is relatively simple (antenna, oscillator, signal processor) and the modeling approach described in the research provides a clear path to a prototype.
Wedge clarity
5/5
The 'screening step in front of XRF' is a perfect wedge, positioning the tool as a fast filter rather than a replacement for gold-standard assays.
Simplicity / focus
5/5
The product is a single-purpose benchtop reader with one clear function: consistency checking for bullion.

Scored by Gemma 4 · 11 Oct 2026. Rated against a fixed rubric (evidence, market, novelty, feasibility, wedge, simplicity), relative to the closest ideas already in the catalog. A prior estimate to compare ideas before real-world signal arrives.

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Who benefits

  • APMEXcompany

    One of the largest online precious metals retailers; a fast, non-destructive screener for inbound bullion reduces exposure to tungsten-cored and mislabeled pieces.

  • Professional Coin Grading Service (PCGS)company

    Coin authentication and grading service for which counterfeit detection is core; an eddy-current signature check adds a bulk-response signal alongside surface methods.

  • Money Metals Exchangecompany

    Bullion dealer buying from the public and distributors; screening bars and coins at intake protects margins on resale.

  • FirstCashcompany

    Operates pawn stores where employees buy gold from walk-in sellers; a simple consistent/anomalous read catches fakes that visual checks miss.

  • Professional Numismatists Guildorganization

    Dealer association focused on integrity and counterfeit awareness; a low-cost screening device gives member dealers a standard verification step.

Research it builds on

  1. METALLOFIZIKA I NOVEISHIE TEKHNOLOGII
    Instytut Metalofizyky Im. H. V. Kurdjumova (Kiew) · 2026 · 113 citations
    All ideas from this paper →
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