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Message:: [QUOTE="KurtS, post: 2252600, member: 11786"]Update: here are some XRF results for ancient and modern silver coins--<a href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0CEQQFjAFahUKEwjJnYq0_MLIAhWVWYgKHTmUDlE&url=http%3A%2F%2Fsiba-ese.unisalento.it%2Findex.php%2Fpsba3%2Farticle%2Fdownload%2F13257%2F11819&usg=AFQjCNHv1uwMg1vyVBp5yh3pEqwGO0vpSQ&sig2=IWrvURuMcsGLwDUnWNYPpQ" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0CEQQFjAFahUKEwjJnYq0_MLIAhWVWYgKHTmUDlE&url=http%3A%2F%2Fsiba-ese.unisalento.it%2Findex.php%2Fpsba3%2Farticle%2Fdownload%2F13257%2F11819&usg=AFQjCNHv1uwMg1vyVBp5yh3pEqwGO0vpSQ&sig2=IWrvURuMcsGLwDUnWNYPpQ" rel="nofollow">source here</a>. There is one US coin included, which has a significantly lower silver content than expected. I'll keep this thread going as I find new data. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> <img src="https://c2.staticflickr.com/6/5661/22149012896_0b8328d77f_b.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]