currency defects – US Notes

Tape Repairs on Paper Money: How to Detect Them Under UV Light and Their Catastrophic Effect on Value

June 15, 2026 by

Tape repairs are among the most damaging and deceptive alterations a collector can encounter on paper money, capable of slashing a note’s value by 80 percent or more. Learn how professional graders detect hidden repairs under ultraviolet light, which tape types leave which signatures, and how to protect yourself at shows, auctions, and dealer tables.

Ink Crystallization on Intaglio-Printed Currency: The Surface Defect That Looks Like an Error But Occurs After Printing

June 15, 2026 by

Ink crystallization is one of the most misunderstood surface phenomena in paper money collecting, frequently mistaken for a printing error or deliberate variety. Understanding what causes it, how to identify it, and how it affects a note’s grade and value can save collectors from costly mistakes and reveal hidden gems hiding in plain sight.