Altered Flags

This page documents how professional grading companies and experienced collectors detect altered, trimmed, or otherwise modified trading cards. Understanding these detection methods helps you avoid accidentally crossing the line during restoration and recognize altered cards when buying.

Also on this page
  • Overview
  • PSA Detection Methods
  • The N5 and N8 Flags
  • PSA Detection Technology
  • The Cognex Scanner System
  • What Cognex Detects
  • What It Can't Detect
  • Lighting Techniques for Detection
  • UV Light (Blacklight)
  • Coaxial Lighting
  • Raking Light (Oblique Angle)
  • Visual Signs of Alteration
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This page is part of the Card Conservation Wiki member library — the working reference behind The Cardboard Alchemists. Technique pages with tested settings, the Card Sensitivity Database, logged incidents with the exact parameters that caused them, and community experiments you will not find written down anywhere else.
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