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<p>[QUOTE=&quot;-JJH-, post: 1034436, member: 6852&quot;]Hello all,</p><p>As I collect Kingdom of Italy coins, I have encountered the problem that surrounds the 1939 and 1940 stainless steel coins. Standard Catalog of World Coins divide the coins into &#039;magnetic&#039; and &#039;non-magnetic&#039; - and the difference in the alloy is in Nickel content. So called &#039;magnetic&#039; grade does not contain Nickel, but the &#039;non-magnetic&#039; alloy contains app. 8% Nickel.</p><p><br /></p><p>Ok, sounds fairly easy at the moment. But then I found out that in reality we have (I used regular ferromagnet):</p><p><br /></p><p>1) strongly magnetic coins - if you place a magnet within few centimeters of the coin, the coin will &#039;jump&#039; to the magnet.</p><p><br /></p><p>2) weakly magnetic coins - the &#039;jump&#039; effect is not there, but you&#039;re most likely able to lift the coin from the table with a magnet.</p><p><br /></p><p>3) partly magnetic coins - the magnetic effect occurs only some part of the coin, I found that some larger 2 lire coins are non-magnetic in the centre, however, weakly magnetic at the edges.</p><p><br /></p><p>4) non-magnetic coins - no magnetic effect, what so ever.</p><p><br /></p><p><br /></p><p>This lead me to think about this matter and I suddenly realized, that there is a possibility that we cannot separate different alloys by using simply magnets!! For example an austenitic stainless steel, which would be non-magnetic in normal state - this can be transformed into magnetic phase, if the piece of steel is formed (striking with coin dies!!!). Also, since Nickel itself is one of the ferromagnetic metals, this also lead me to think that using simply a magnet would not give accurate results. Just to test my suspicions, I have been thinking about XRF analysis, if I can get hold of some handheld unit at my work...</p><p><br /></p><p>Thoughts anyone? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>-JJ-[/QUOTE]</p><p><br /></p>

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