Excellent article on how counterfeit detector pens work.
The pens detect the starch content in money. Regular paper has starch, currency paper doesn't.
Magician and skeptic James Randi uses an ironing product, spray starch, that makes genuine bills appear counterfeit. Then he returns the starched bills to the bank. Eventually someone will attempt to pass the genuine but starched bill, leading to police, siezed money, etc.
Nomisma measurement analysis interface ready for wider testing - I have been working on and off for the last month or two on a new quantitative analysis feature in Nomisma, which is available on pages for certain types o...
1 week ago