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- From PLMossman@aol.com Mon Oct 07 11:23:38 2002
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Date: Mon, 7 Oct 2002 14:20:26 EDT
Subject: Re: [Colonial Numismatics] RR40
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In a message dated 10/7/2002 2:05:56 PM Eastern Daylight Time,
mhodder@theworld.com writes:
> SG results have validity for any single or binary element object.
> For ternary alloy pieces, like brassy looking coppers (think Pitt
> and N. American and RI Ship tokens), probably most copper
> counterfeits, SG is not indicated. SG's on cast coins can be off due
> to cavitation, preferential alloy segregation in the melt, and other
> factors.
>
> My point is that sp.g. will not identify composition, it will just tell you
> if a supposed copper coin deviates from the norm of pure copper, thus
> raising your level of suspicion that it is of a mixed metal cast
> composition - in this instance a cast fake. Only if it is off will it be
> helpful. All my William III cast planchet coppers have a normal specific
> gravity suggesting that in the striking process, minute air/gas pockets
> were eliminated.
>
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<HTML><FONT FACE=arial,helvetica><FONT SIZE=3 FAMILY="SERIF" FACE="Times New Roman" LANG="0">In a message dated 10/7/2002 2:05:56 PM Eastern Daylight Time, mhodder@theworld.com writes:
<BR>
<BR></FONT><FONT COLOR="#000000" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">
<BR><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">SG results have validity for any single or binary element object.
<BR>For ternary alloy pieces, like brassy looking coppers (think Pitt
<BR>and N. American and RI Ship tokens), probably most copper
<BR>counterfeits, SG is not indicated. SG's on cast coins can be off due
<BR>to cavitation, preferential alloy segregation in the melt, and other
<BR>factors.
<BR>
<BR><B>My point is that sp.g. will not identify composition, it will just tell you if a supposed copper coin deviates from the norm of pure copper, thus raising your level of suspicion that it is of a mixed metal cast composition - in this instance a cast fake. Only if it is off will it be helpful. All my William III cast planchet coppers have a normal specific gravity suggesting that in the striking process, minute air/gas pockets were eliminated.
<BR>Phil</BLOCKQUOTE>
<BR></FONT><FONT COLOR="#000000" SIZE=3 FAMILY="SERIF" FACE="Times New Roman" LANG="0">
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