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<p>[QUOTE=&quot;bullibags, post: 2272849, member: 76270&quot;]Hey Guys so an ultrasound thickness tester can tell you if your gold bar is solid and not filled with something else for example tunsten. Now gold has a speed of sound of 3240 m/s. but what about 14k or 18k does anyone know is it very negligable? if so wouldn&#039;t that mean that part of the bar could be 24k and the center 18k and give you a similar read, hence you losing money?[/QUOTE]</p><p><br /></p>

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