the.com/marked cards
A secret printed in plain sight, betting on you never looking close enough.
means Playing cards that have been secretly altered — by ink, scratches, bends, or subtle pattern changes on the back — so a cheat can read them face-down.
from From 'mark' in the sense of a sign or stamp deliberately put on something, plus 'card' (from Greek 'khartes,' a leaf of papyrus, via Latin and French). The phrase belongs to the long history of gambling and card-sharping; as soon as playing cards spread through Europe — arriving from the Islamic world by the late Middle Ages — so did the temptation to doctor them, and 'marked cards' has named the cheat's basic tool ever since.
- ancient grift
- Cheaters marked cards since playing cards existed in China
- juice marks
- Daub ink visible only at certain angles
- luminous reading
- Marks invisible until viewed through tinted glasses
- block-out work
- Pros alter backs by adding or erasing detail
- reader decks
- Sold legally as magicians' tools, not casino contraband
cops and robbers deck — famous magic trick deck where court cards are subtly marked, used by magicians since the 1800s
shaved deck — cards cut to slightly different dimensions, used in cheating at poker and blackjack in casinos
daub marked cards — cards marked with invisible ink visible only under uv light, discovered in casinos during the 1950s-1960s