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<p>[QUOTE=&quot;desertgem, post: 2896434, member: 15199&quot;]The velocity of sound in 24k gold is 3200 m/sec and it is 5200m/sec in pure tungsten, so it would be easily detect also by a professional ultrasound fault detector. I do doubt the ones sold in bullion ads and ebay for a fraction of the price as the ones below would be able to do so.</p><p><br /></p><p><a href="https://www.olympus-ims.com/en/applications/ut-testing-gold-bars/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.olympus-ims.com/en/applications/ut-testing-gold-bars/" rel="nofollow">https://www.olympus-ims.com/en/applications/ut-testing-gold-bars/</a></p><p>Jim[/QUOTE]</p><p><br /></p>

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