Fr srs?

(Falstaff's Spiritual Successor, Mon 8 Nov 2010, 17:33, 1 reply)

Dunno about cheques but cash has tech to stop copying
If you look closely at banknotes you'll see apparently random groups of yellow dots on them. (On a tenner, to the left of the Queen's head, in the otherwise fairly clear bit)
These tell colour photocopiers (and possibly scanners but not sure) that you're trying to copy cash and to not let you.

See en.wikipedia.org/wiki/EURion_constellation
( Snappyuk gets BIGGER with free sample., Mon 8 Nov 2010, 22:34, closed)

I've sometimes considered getting a t-shirt made with this pattern on
See what it gums up...
(Richy_T hundreds if not thousands of dollars, Tue 9 Nov 2010, 3:22, closed)