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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 ...
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 ...
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).
Sonochemistry can be performed by using a bath (usually used for ultrasonic cleaning) or with a high power probe, called an ultrasonic horn, which funnels and couples a piezoelectric element's energy into the water, concentrated at one (typically small) point.
A real British pound coin, of the old type, on top of a fake.This coin was often counterfeited. Defective milling and letters on a counterfeit coin (top) For modern coins in general circulation, the most common method of protection from forgeries is the use of bi-metallic coins made of two metals of different color, which are difficult to counterfeit at low cost.
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 ...
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