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2. Coin cleaning - Wikipedia

   en.wikipedia.org/wiki/Coin_cleaning

   Solutions from pencil erasers to wire brushes and potassium cyanide were all used as cleaning agents with the goal to make the coin look brilliant again. When certified grading came into use in the mid 1980s though, the practice of cleaning coins diminished over time. Most coin experts have since come out against cleaning coins, as doing so can ...

3. Black money scam - Wikipedia

   en.wikipedia.org/wiki/Black_money_scam

   The black money scam, sometimes also known as the "black dollar scam" or "wash wash scam", is a scam where con artists attempt to fraudulently obtain money from a victim by convincing them that piles of banknote-sized paper are real currency that has been stained in a heist. The victim is persuaded to pay fees and purchase chemicals to remove ...

4. Ultrasonic cleaning - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_cleaning

   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 gal), to large industrial units with volumes approaching 1,000 litres (260 US gal).

5. Glossary of numismatics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_numismatics

   This "cleanliness" is a result of the surface of the coin being dissolved by the acid. Dipped coins almost always have a lower numismatic value than when they were in their former "dirty" state, hence most numismatists do not recommend dipping or any other method of cleaning coins as doing so will likely reduce the coin's value. Double Eagle (U ...

6. Megasonic cleaning - Wikipedia

   en.wikipedia.org/wiki/Megasonic_cleaning

   It is a type of acoustic cleaning related to ultrasonic cleaning. Similar to ultrasonic cleaning , megasonic cleaning uses a transducer that sits on top of a piezoelectric substrate. [ 1 ] The transducer creates acoustic waves at a higher frequency (typically 0.8–2 MHz ) than ultrasonic cleaning (20-200 kHz ).

7. We’re Obsessed With These 50 Strange Items That Solve Real ...

   www.aol.com/not-average-solutions-50-wacky...

   Buy Now: amazon.com #8 Keep Your Home Clean With The Mudbuster Portable Dog Paw Cleaner. Review: "Best thing ever during those spring break up and/or thise rainy muddy autumns.I have a golden ...