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To: long-gone who wrote (87033)6/17/2002 11:29:29 PM
From: E. Charters  Read Replies (1) | Respond to of 116930
 
Postal irradiation will turn slightly yellow diamonds a red colour. It will also discolour and spot photographic paper, and undeveloped negatives, make metal objects radioactive which will cause long term danger of inoperable cancers, create low level radioactive dust which will contaminate vegetables, cause postal workers hair to fall out and clocks to run backwards.

Other than that, its harmless.

Drill bit companies do use radiation to colour diamonds.



To: long-gone who wrote (87033)6/18/2002 10:21:18 AM
From: Dennis O'Bell  Read Replies (1) | Respond to of 116930
 
U.S. Postal Service Irradiation Process May Affect Some Gemstones

This is a well known quantum mechanical effect in crystal lattices, the technical term is "color centers" if you want to do a Google or other search.

webexhibits.org

I hadn't heard that any Postal radiation was intense enough to cause this though and kind of doubt they're going to widely use radiation intense enough to cause a problem.



To: long-gone who wrote (87033)6/18/2002 1:26:28 PM
From: goldsheet  Read Replies (1) | Respond to of 116930
 
> U.S. Postal Service Irradiation Process May Affect Some Gemstones

It also affects paper, like US currency.
Saw photos of damaged banknotes a few month ago in either Coin World or Numismatic News.