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2. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   There are many models of Gold Purity Testing machines available - from portable (light weight) to industrial grade machines. Apart from X-ray spectrometer technique, other older traditional methods are using the TouchStone and Acid to test the gold purity. But TouchStone and Acid are destructive testing - a tiny sample of gold is cut and then ...

3. Touchstone (assaying tool) - Wikipedia

   en.wikipedia.org/wiki/Touchstone_(assaying_tool)

   This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.

4. 15 Best Places To Sell Your Gold for Cash

   www.aol.com/15-best-places-sell-gold-145103625.html

   15 Best Places To Get Cash for Gold. If you are looking for a place to sell gold, there is no shortage of options. ... Buyers will assess the purity using acid tests or electronic testers to ...

5. Scientists find way to make gold from electronic waste

   www.aol.com/news/scientists-way-gold-electronic...

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6. Bond tester - Wikipedia

   en.wikipedia.org/wiki/Bond_tester

   A bond tester is a scientific instrument used to measure the mechanical strength of bonds, evaluate bond strength distributions or determine compliance with specified bond strength requirements of the applicable acquisition document.

7. Gold Coins and Bars: 5 Strategies To Get the Best Possible ...

   www.aol.com/gold-coins-bars-5-strategies...

   In both cases, getting the best possible price begins with researching the gold market and finding out where buyers pay a premium. Discover: 5 Places To Look for Rare Coins Worth A Lot of Money