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DJR Expert Guide Series, Vol. 286 — Ultrasonic Thickness Testing for Plated Coin Forgeries
Ultrasonic testing is one of the most powerful non-destructive forensic tools available for detecting plated and composition-altered coins. While XRF reveals surface composition, ultrasonic analysis exposes what lies beneath—identifying hidden plating layers, hollow structures, solder plugs, density inconsistencies, internal cavities, and foreign-metal cores that cannot be seen visually. As counterfeiters adopt advanced electroplating, vapor deposition, and precision machining, ultrasonic analysis has become essential for professional numismatic authentication.
DJR Expert Guide Series, Vol. 286 — Ultrasonic Thickness Testing for Plated Coin Forgeries provides a complete, lab-grade workflow for using ultrasonic equipment to detect plating shells, clad layers, base-metal cores, welded seams, internal voids, and structural manipulation. This guide explains how to calibrate equipment, interpret wave velocity, verify thickness against mint specifications, and integrate ultrasonic results with XRF and visual forensics.
Inside, you’ll learn how experts:
Use ultrasonic gauges to measure internal density & structural continuity
Detect plating shells, clad layers & abrupt velocity changes indicating layered metals
Interpret acoustic velocities for silver, gold, copper, nickel & bronze alloys
Identify voids, solder plugs, hollow areas & internal filler seams
Compare thickness readings to official U.S. Mint and world-mint specifications
Scan rims to detect uneven thickness, weld seams & fused halves
Reveal alloy mismatches between surface composition and internal metal
Distinguish electroplated, laminated, cast & CNC-milled forgeries
Interpret waveform anomalies such as double echoes, missing reflections & noisy returns
Avoid false positives caused by rim damage, corrosion pits, tilt angle & poor couplant use
Combine ultrasonic findings with XRF, die-state analysis & physical forensics
Volume 286 provides collectors, graders, and dealers with a complete, defensible scientific framework for detecting plated coin forgeries—ensuring accuracy even when external appearance appears genuine.
Digital Download — PDF • 7 Pages • Instant Access
Ultrasonic testing is one of the most powerful non-destructive forensic tools available for detecting plated and composition-altered coins. While XRF reveals surface composition, ultrasonic analysis exposes what lies beneath—identifying hidden plating layers, hollow structures, solder plugs, density inconsistencies, internal cavities, and foreign-metal cores that cannot be seen visually. As counterfeiters adopt advanced electroplating, vapor deposition, and precision machining, ultrasonic analysis has become essential for professional numismatic authentication.
DJR Expert Guide Series, Vol. 286 — Ultrasonic Thickness Testing for Plated Coin Forgeries provides a complete, lab-grade workflow for using ultrasonic equipment to detect plating shells, clad layers, base-metal cores, welded seams, internal voids, and structural manipulation. This guide explains how to calibrate equipment, interpret wave velocity, verify thickness against mint specifications, and integrate ultrasonic results with XRF and visual forensics.
Inside, you’ll learn how experts:
Use ultrasonic gauges to measure internal density & structural continuity
Detect plating shells, clad layers & abrupt velocity changes indicating layered metals
Interpret acoustic velocities for silver, gold, copper, nickel & bronze alloys
Identify voids, solder plugs, hollow areas & internal filler seams
Compare thickness readings to official U.S. Mint and world-mint specifications
Scan rims to detect uneven thickness, weld seams & fused halves
Reveal alloy mismatches between surface composition and internal metal
Distinguish electroplated, laminated, cast & CNC-milled forgeries
Interpret waveform anomalies such as double echoes, missing reflections & noisy returns
Avoid false positives caused by rim damage, corrosion pits, tilt angle & poor couplant use
Combine ultrasonic findings with XRF, die-state analysis & physical forensics
Volume 286 provides collectors, graders, and dealers with a complete, defensible scientific framework for detecting plated coin forgeries—ensuring accuracy even when external appearance appears genuine.
Digital Download — PDF • 7 Pages • Instant Access