Daub is a paste used to secretly mark a playing card by giving it a shiny or tinted smudge, which can be used as a Key Card.
Originally the invention of card sharps to mark cards during play, it was being sold in gambling catalogs by at least 1911.
- PART 5. MISCELLANY page 417. Daub in Expert Card Technique by Jean Hugard (1940)
- PART FOUR - Daub Deception, Greater Card Tricks by Eddie Joseph (1942)
- Tricks With Daub by Ed Marlo (1945)
- Dabbling with Daub by Irv Weiner (1951), reprint in New Jinx Vol. 6, No. 70, February 1968 and in The New Jinx 1962-1968 published by Kaufman and Greenberg in 1987.
- ↑ Special Goods Catalog 1911 by G.L. Lee & Co.