One common method of detecting counterfeits (if the sound of the coin on a table or the colour of the metal does not indicate something suspicious) is to check whether the reverse matches the edge inscription for the alleged year - it is extremely common for counterfeiters to get this wrong.

However, to detect such counterfeits requires the Art, and the Art is clearly not much known on this world.

Vending machines, for one, are sensitive to these magnetic inks and use them to detect counterfeits.

The treasury is also scanning bills regularly to detect counterfeits.

A trace of synthetic human DNA embedded with a hidden code and then applied to a designer dress, a CD or a DVD, or mixed into brand-name perfume, for example, could be used to authenticate a product - and enable someone with the key to the code to detect counterfeits.

Noting that The Shadow was still present, Gilling smiled and added a statement to the new guest: "This man - Royan - is an expert at detecting counterfeits.

Color shifting ink on the value number at the back of the note For the first time in the world, the KOMSCO, the Korean mint, inserted a new substance in the notes to detect counterfeits.

The exact measurements and weights made it easy to detect lightweight counterfeits.

Though I am no longer active as a banker, I have continued my study of currency and can pride myself on my ability to detect counterfeits.

But 80 percent of the world's nations, pharmacology experts estimate, lack drug agencies capable of detecting sophisticated counterfeits.