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2. Ultrasonic cleaning - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_cleaning

   Sonorex ultrasonic cleaner from the 1970s or 1980s Ultrasonic cleaning of a mobile phone. Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than 0.5 litres (0.13 US ...

3. Jewellery cleaning - Wikipedia

   en.wikipedia.org/wiki/Jewellery_cleaning

   Ultrasonic cleaner showing the removable basket in place, and a closeup of the light and timer Ultrasonic cleaners are useful for jewelry cleaning and removing tarnish. They use ultrasound waves and chemicals combined to create bubbles that "cling" to the foreign particles such as dirt, oil, and unknown substances.

4. How to Properly Clean Brass, According to an Expert - AOL

   www.aol.com/properly-clean-brass-according...

   Bougere recommends for anyone cleaning brass for the first time to invest in a reliable and time-saving solution, such as Goddard's Brass & Copper Polish. Trusted cleaning products help to ...

5. Sonication - Wikipedia

   en.wikipedia.org/wiki/Sonication

   Sonication machines for record cleaning at Swiss National Sound Archives. Sonication is the mechanism used in ultrasonic cleaning—loosening particles adhering to surfaces. In addition to laboratory science applications, sonicating baths have applications including cleaning objects such as spectacles and jewelry.

6. Coin cleaning - Wikipedia

   en.wikipedia.org/wiki/Coin_cleaning

   Coin cleaning is the controversial process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. The subject is disputed among the numismatic community whether cleaning coins is necessary. Those that argue in favor of cleaning are also in dispute on which methods work best.

7. Conservation and restoration of copper-based objects

   en.wikipedia.org/wiki/Conservation_and...

   Wood and wood based products (particle board, plywood) must be avoided. Also do not use rubber, felt or wool. When you are handling metal objects, always wear clean cotton gloves . Lighting levels must be kept below 300 lux (up to 150 lux in case of lacquered or painted objects, up to 50 lux in case of objects with light sensitive materials).