Features
Part of Bullion authentication guide: evidence and limits
Conflicting silver bar tests: a fictional case
A fictional case of conflicting silver bar tests shows how XRF, weight, dimensions, conductivity, and ultrasound results were documented and resolved by a lab.
What to take away
- A plausible surface spectrum did not resolve an internal inconsistency.
- A known reference exposed one bad conductivity setup.
- Repeatable dimensional and ultrasonic results justified escalation.
- The owner preserved packaging and seller deadlines before further testing.
- The final report stated both composition findings and method limits.
This fictional case of conflicting silver bar tests demonstrates evidence handling. Figures are illustrative and do not define a genuine product specification.
Initial purchase
Leah bought a sealed ten-ounce silver bar from an online seller. The invoice named the manufacturer, nominal weight, claimed fineness, dimensions, assay card, and serial. On receipt, the package looked intact, but the bar appeared slightly thicker than the saved manufacturer specification.
She opened a case file, photographed every side, preserved the shipping materials, and left the card sealed. The return period had twelve days remaining.
First test set
| Check | Result | Initial interpretation |
|---|---|---|
| Package and serial | Internally matched | Supportive, not conclusive |
| Gross packaged weight | Consistent with dealer reference | Supportive, package mass unknown |
| External dimensions | Thickness repeatedly high | Inconsistent |
| Magnet attraction | None observed | Did not reject item |
| Conductivity through package | Out of expected range | Concerning but unverified |
| XRF at two exposed card windows | Silver-dominant spectrum | Surface consistency only |
Leah did not average these into a score. The methods measured different things, and the packaging complicated several results.
First Test Set Results
Check
- Package and serial
- Internally matched
- Gross packaged weight
- Consistent with dealer reference
- External dimensions
- Thickness repeatedly high
- Magnet attraction
- None observed
- Conductivity through package
- Out of expected range
- XRF at two exposed card windows
- Silver-dominant spectrum
Result
- Package and serial
- Supportive, not conclusive
- Gross packaged weight
- Supportive, package mass unknown
- External dimensions
- Inconsistent
- Magnet attraction
- Did not reject item
- Conductivity through package
- Concerning but unverified
- XRF at two exposed card windows
- Surface consistency only
Interpretation
- Package and serial
- Gross packaged weight
- External dimensions
- Magnet attraction
- Conductivity through package
- XRF at two exposed card windows
Method audit
She tested the conductivity instrument on a known reference of suitable size. It also failed. The selected sensor mode required a thickness setting that had been entered incorrectly. After correction, the control classified correctly and the suspect bar moved closer to the expected range, though one point remained outside the dealer's documented band.
Conductivity Instrument Correction
- Test instrument on known reference
- Reference also fails
- Identify incorrect thickness setting
- Correct sensor mode setting
- Control classifies correctly
- Suspect bar moves closer to expected range
This prevented a false conclusion from an invalid setup.
NIST's review of field X-ray fluorescence analysis describes XRF as a rapid method for identifying elements but notes limited test regions, incomplete elemental coverage, and the need for periodic calibration with reference standards. Leah treated the silver-dominant readings as localized elemental evidence, not proof of the whole bar.
Second test set
A qualified dealer repeated weight and dimensions with logged instruments, then used ultrasound at several mapped positions. Thickness remained high beyond the seller's stated tolerance. Two ultrasonic paths differed from the known reference response. The dealer did not declare composition from those readings; the report recommended laboratory examination.
Second Test and Seller Notice
- Dealer repeats weight and dimensions
- Ultrasound at mapped positions
- Thickness remains high
- Two ultrasonic paths differ
- Dealer recommends laboratory exam
- Leah sends written notice before deadline
- Seller agrees to independent examination
Leah sent the seller a written notice before the return deadline. It stated the exact inconsistencies, attached raw records, and requested either seller-authorized independent examination with deadline protection or a refund. The seller agreed to the examination and insured transport.
Laboratory result
The laboratory documented chain of custody, imaged the package, and used methods capable of comparing surface and bulk structure. Its report concluded that the external layer was high-fineness silver but the interior was not uniform with the claimed product. It did not assign a coin grade or estimate resale value.
That scope mattered. A composition report and a density check answer different questions. Reference densities of the elements puts silver near 10.5 grams per cubic centimeter, lead roughly 11.34, and tungsten and gold about 19.3.
So density separates some substitutions cleanly and others barely. Leah recorded which question each test could answer before weighing what the answers were worth.
Remedy and closure
The seller accepted the report and resolved the return under the agreed terms. Leah reconciled the card credit, saved the transport and return records, and marked the inventory entry "returned, identity not as invoiced." She did not retain or resell the bar.
She also reviewed two earlier purchases from the same seller as separate cases. Both matched their own official specifications and independent tests. The disputed bar did not prove every item from that seller was defective.
Lessons from the sequence
- Validate instruments with an appropriate known reference.
- Keep surface and bulk conclusions separate.
- Map each test location and retain raw files.
- Preserve return rights before lengthy examination.
- Ask the laboratory a specific question.
- Close the inventory and payment records after the remedy.
Common questions
Why did the first conductivity result not settle the case?
The known reference also failed, showing that the setup was invalid.
Why was surface XRF insufficient?
It characterized tested near-surface regions but did not resolve the bar's internal uniformity.
Why did the seller pay for testing?
That was the fictional agreement reached before shipment to the laboratory, not a universal rule.
Why were earlier purchases reviewed separately?
Each item required its own identity, reference, evidence, and conclusion.
