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<p>[QUOTE=&quot;desertgem, post: 1920259, member: 15199&quot;]I can understand the weighing, the use of a balance was long established </p><p>But how did they determine the purity? Specific gravity didn&#039;t come until about 250BC,&nbsp; the use of acids in analysis by Islamic chemists has been mentioned in several books, but no confirmed dates, so how would they know if it was a 90% glob, or a 40% glob?&nbsp; Usually when something is used for transaction of value, the total amount of the actual valuable material is important.[/QUOTE]</p><p><br /></p>

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