Part I: Card Game Cheating · CARD MARKING METHODS
Flash Marking
How it works
Flash is an inverted marking strategy that deceive those who know how to read standard luminous or juice marks. Instead of reading the darker marks left by the marking solution, the cheater reads the AREAS THAT WERE NOT MARKED. When using “juice for blue cards,” Flash creates lighter areas on blue-backed cards rather than darker ones. Most people trained to detect marking look for darker “shade” patterns, not lighter “flash” patterns. This technique is particularly effective for deceiving casino inspectors and surveillance personnel who have been trained to look for traditional dark marks.
Where it appears
Poker, Blackjack, primarily blue-backed card games
On the record
Flash marking was developed specifically as a counter-detection technique, designed to fool inspectors looking for traditional marking patterns.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches flash marking, and what stops it recurring, written for the desk, not the reader.
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Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction: the method is described so it can be recognised.