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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).
Counterfeit money is currency produced outside of the legal sanction of a state or government, usually in a deliberate attempt to imitate that currency and so as to deceive its recipient. Producing or using counterfeit money is a form of fraud or forgery , and is illegal in all jurisdictions of the world.
The cleaner would first inspect the jewelry to ensure that the gemstones are accounted for and secured. Materials that can handle it are often placed in an ultrasonic bath using a cleaning solution and later put through a steam cleaner, while more sensitive materials will go through light brushing in soapy water.
Branson Ultrasonics specializes in the design, development and manufacturing of plastics joining and metal welding equipment. The company develops solutions for precision cleaning, degreasing and processing. The company also has expertise in ultrasonic tooling and magnetostrictive and piezoelectric technology.
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.
"To Counterfeit is Death" - counterfeit warning printed on the reverse of a 4 shilling Colonial currency in 1776 from Delaware Colony American 18th–19th century iron counterfeit coin mold for making fake Spanish milled dollars and U.S. half dollars Anti-counterfeiting features on a series 1993 U.S. $20 bill The security strip of a U.S. $20 bill glows under black light as a safeguard against ...
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