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<p>[QUOTE=&quot;2manybooks, post: 9506756, member: 8267&quot;]XRF = X-ray fluorescence. It can identify materials based on their reaction to X-rays. The limitation of XRF is that it can only slightly penetrate the surface of the material being analyzed. X-rays can only penetrate gold 8-10µm (micrometers), so it may not be accurate if it is used to analyze gold-filled jewelry. It may see the gold on the surface, but not the underlying metal, depending on the thickness of the gold on the surface.</p><p><br /></p><p>When discussing the difficulty of identifying forged coins created with gold-coated tungsten, Peter Zygorzynski notes: &quot;if XRF was used to test a copy that had been gilded, the results were often correct; however, if the copy had a coating of [thicker] gold plate, the results would be entirely incorrect.&quot;</p><p><a href="https://coinsweekly.com/how-to-tell-cheap-tungsten-from-precious-gold/#:~:text=It%20was%20also%20unclear%20whether,be%20considered%20reliable%20or%20conclusive" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://coinsweekly.com/how-to-tell-cheap-tungsten-from-precious-gold/#:~:text=It%20was%20also%20unclear%20whether,be%20considered%20reliable%20or%20conclusive" rel="nofollow">https://coinsweekly.com/how-to-tell-cheap-tungsten-from-precious-gold/#:~:text=It was also unclear whether,be considered reliable or conclusive</a>.</p><p><br /></p><p>I would ask the people at the shop how the chain was tested and identified as gold-filled before assuming it was &quot;solid 10k gold&quot;.[/QUOTE]</p><p><br /></p>

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