Song Dynasty China Público Deposited
Re
[Colonial Numismatics] Cast Iron Coinage Metallurgical Study
- From johnmenc@optonline.net Fri Sep 19 21:22:22 2003
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Date: Sat, 20 Sep 2003 04:22:20 -0000
To: colonial-coins@yahoogroups.com
Subject: Re: [Colonial Numismatics] Cast Iron Coinage Metallurgical Study: Song Dynasty China
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From: "John Lorenzo" <johnmenc@optonline.net>
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I will send you the article just E-Mail me your address. Once you
read it let's talk.
Its a beautiful thing - scanning electron mettalography and EDX.
The "two" really worked together nicely to define the fuel source,
production method and ore type all from the analysis of these Chinese
coins.
Coin microstructures were broken down by:
1. the actual microstructure (i.e.,ledeburite)
2.Proeutectic phase
3.phosphorous content
4.sulphide inclusions
5.types of gas porosity (two generic types of voids in cast coins)
This above coupled with P+Si+S contents broke out the coins to two
different geographical areas based on inherent characteristics.
Current thinking and anlytical methodologies at this time require
this two phase testing (i.e., microstructure and compositional make-
up) to isolate coins to specific georgraphical areas and/or
production type processes.
YES - it is easier when your working in the Bronze age or in earlier
periods since ore sources, production sites and coin production areas
do usually form these nice little triangles.
--- In colonial-coins@yahoogroups.com, Dan Freidus <freidus@w...>
wrote:
> John,
>
> "Energy dispersive X-ray microanalysis (EDX). Also XRF as required."
>
> Did they say why they're doing XRF if they've already done EDX?
What
> additional info would it yield?
>
> I've considered getting a bit of training so I can do EDX (I have
> access to an instrument that's inexpensive if I use it but
expensive
> if I pay to have someone else do the work. I just have to pay once
> to go through perhaps a half day of training and then a reasonable
> hourly fee to use the machine.) I like the way the electron
> microscope allow syou to pinpoint a specific small area on a coin.
> This would be good for looking at variability in composition,
> including identifying visible inclusions. We've all seen colonila
> sthat have spots of different colors (slag, junk, etc.). Perhaps
> indentifying those bits may help us understand more about planchet
> preparation.
>
>
> Thanks,
> Dan - 2003-09-19
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