Author Topic: Identifying a BI fake.  (Read 2290 times)

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Offline @josephjk

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Re: Identifying a BI fake.
« Reply #15 on: November 21, 2015, 05:10:27 PM »
The weight shown on that website is the variation for UNC coins, circulated coins might lose some more...

On the coin above.... I think it's called 'weak strike'

Offline Figleaf

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Re: Identifying a BI fake.
« Reply #16 on: November 21, 2015, 05:58:47 PM »
Pray, how do you best perform a "ping" test?

This test does not determine if a coin is silver or not, but whether it is cast or struck. Since all BI coins are struck, coins that sound like casts are fakes. The test works by the sound of metal on metal, since struck coins are compressed by the striking process, giving a higher density of the metal than in a cast coin. Cast metal will give a dull "thud" sound, while struck coins will yield a clear, high "ping". The test works best a larger coins, including rupees, but is difficult to execute on small coins. Also, weakly struck coins may give confusing results and it takes some practice to distinguish the two sounds. You can practice on your struck duplicates and some cash coins.

To do the test, place the coin on a fingertip and touch it with a long metal object. Forks are perfect, but likewise shaped objects will work also. Make sure the coin doesn't fall off your fingertip.

With some experience, you can also see find unprofessionally cast coins, without doing the ping test. Casting is a difficult process. If it is not done right, small air bubbles will remain on the surface of the cast object, showing up as pin-sized holes on a fake.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.