I think I just invented a way of determining karat of gold coins using an IR camera.

[Nick Gromicko]

The Chinese regularly pump out fake U.S. silver dollars. They look just like the real thing but are not made of all silver. I have a bunch (yes, I got snookered). I've already convinced myself that I can detect these counterfeits with an IR camera and a kitchen oven.

[John McKenna]

Originally Posted by gromicko

The Chinese regularly pump out fake U.S. silver dollars. They look just like the real thing but are not made of all silver. I have a bunch (yes, I got snookered). I've already convinced myself that I can detect these counterfeits with an IR camera and a kitchen oven.

Funny.

I can see it now... Nick will be staying up late at night with all his
money in the oven.... LOL..

[Nick Gromicko]

Silver took a hit on Monday http://www.kitco.com/charts/livesilver.html

[Brian E. Kelly]

I don't think I read the whole thread correctly. I just went to the oven to check on the Silver Certificates I put in about thirty minutes ago and I am sure they are Chinese copies, as all that are left is ashes.

[Michael Larson]

Originally Posted by gromicko

The Chinese regularly pump out fake U.S. silver dollars. They look just like the real thing but are not made of all silver. I have a bunch (yes, I got snookered). I've already convinced myself that I can detect these counterfeits with an IR camera and a kitchen oven.

I would think the Fed would want to know that Nick.

P.S. Please don't use these for the daily door prizes.

[bdoles2]

Originally Posted by bkelly2

I don't think I read the whole thread correctly. I just went to the oven to check on the Silver Certificates I put in about thirty minutes ago and I am sure they are Chinese copies, as all that are left is ashes.

How much did the ashes weigh!

[William J. Decker]

Different alloys and content has different thermal mass. It would be hard to determine because the emissivity is only measured on the surface (silver plated rather than pure silver) with any underlying substrate metal conducting.

Much easier ways of deteriming purity. Determine volume of coin (water emersion) then determine weight and calculate density. Look up density in the CRC and determine the difference.

But your way is much more fun, Nick.

[Michael Larson]

Originally Posted by wdecker

But your way is much more fun, Nick.

And it comes with cookies too.

[jmcmahon]

Nick If I send you all my gold will you check it for me ?

[rmaday]

Does the reverse work? If you freeze them?

The coins, not the cookies.

[Nick Gromicko]

Oh heck Richard, now I'll be emptying my freezer tonight so I can test.

Guess I'll be eating 8 frozen dinners tonight.

[Michael Larson]

Originally Posted by gromicko

Oh heck Richard, now I'll be emptying my freezer tonight so I can test.

Guess I'll be eating 8 frozen dinners tonight.

Get some dry ice Nick. It's much colder.