Ping Test

[royalecraig]

Hi

New to stacking and learning how to test bulliion coins.

I was using the magnet, weight and ping tests.

My son has perfect pitch and was able to differentiate between coins.

I don't have any fake coins to test with, where can I buy fake coins from.

For those of us not gifted with perfect pitch, there are pitch apps used for instrument tuning on the app store.

I only have britannias and eagles to test against.

Can anyone confirm whether using these tools would be a valuable test to spot fakes.

You can also buy hardware that guitarists use for tuning.

Anyone ever used one to test the resonant frequency of bullion

Regards

 

Adrian

[sovereignsteve]

4 minutes ago, royalecraig said:

I don't have any fake coins to test with, where can I buy fake coins from.

For those of us not gifted with perfect pitch, there are pitch apps used for instrument tuning on the app store.

Ebay or direct from China (AliExpress.com)

Someone on here was talking about an app for measuring the pitch profile of coins.

 

 

[ilovesilverireallydo]

19 minutes ago, royalecraig said:

I was using the magnet, weight and ping tests.

 

Frankly the only real test to tell if bullion is fake is a sigma... 

[HawkHybrid]

47 minutes ago, royalecraig said:

I don't have any fake coins to test with, where can I buy fake coins from.

 

you don't need fakes. use a 2p, 10p and pretend that

that someone is trying to pass those off as silver

coins. the coin itself should not matter in a ping test,

just it's uniformity and metal content should show up.

 

HH

[Pete]

I started studying the ping test as a coin fingerprint technique and made good progress but as it became too time consuming I abandoned further work.

I published some results somewhere on this forum and described the technique.

I recorded the "ping" on my PC or MAC and used a free musician's software called Audacity to run a spectrum analysis.
The resonant frequencies were unique for a particular coin.

[vand]

It's not like all silver coins produce the same pitch when pinged - different silver coins will ping differently depending on its dimensions. But if you know how a genuine coin X sounds, then its easer to spot a fake.

 

[royalecraig]

There are tuning apps musicians use to tune guitars and piano etc.

Freely available on the app stores

These apps might be a good test for Bullion coins.

For example, My Britannia pings at C

My Eagle at G#

These apps Might be a good test for spotting a fake among a collection.