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Hi. I'm Anthony - with no expertise in horology, just very interested.
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Geo Makes sense, sonic shock wave transfer energy in fluid fields, match the natural frequency of a mass body to break it by the energy imparted to the body.
If you got no result blasting away vintage dried oil, you just have not matched it's bodies natural frequency.
Geo got results with his ultrasonic cleaning machine, shows he produced the required natural frequency in his machine.
The question remains, what machine provides the range of frequencies required to blast away the dried oil in a jewel? I think Ultrasonic machines have been designed to produce many frequencies simultaneously which add up sinusoidaly ( fourer functions), yet we hear some folks saying ultrasonic are no good for cleaning jewels and others say they are good.