@thepiece_london: XRF machines to test gold - let’s go! The machine emits an x-ray (primary ray) which excites atoms in the test material. The X-ray is remitted back to the machine (secondary ray) and the machine can tell from its frequency which elements make up the material. Science! Who knew. #testinggold #vintagegold #todayilearned

Sarah TPL & Kirica Fine

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Sunday 01 October 2023 09:50:36 GMT