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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. Goldsikka ATM - Wikipedia

   en.wikipedia.org/wiki/Goldsikka_ATM

   It can dispense gold coins ranging from 0.5 grams to 100 grams. [11] [12] [13] In the machine, people can use credit or debit card. [14] It gives 24/7 service to their customers [15] and also gives the live price of gold. [16] The gold will be of 24 carat and can store 5 kg gold. [17] [18] It gives pure and hallmarked gold coins. [19]

4. Metallurgical assay - Wikipedia

   en.wikipedia.org/wiki/Metallurgical_assay

   Silver is assayed by titration, gold by cupellation and platinum by inductively coupled plasma optical emission spectrometry (ICP OES). [ 1 ] [ 2 ] Precious metal items of art or jewelry are frequently hallmarked (depending upon the requirements of the laws of either the place of manufacture or the place of import).

5. 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.

6. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

7. Metal detector - Wikipedia

   en.wikipedia.org/wiki/Metal_detector

   Many manufacturers of these new devices brought their own ideas to the market. White's Electronics of Oregon began in the 1950s by building a machine called the Oremaster Geiger Counter. Another leader in detector technology was Charles Garrett, who pioneered the BFO (beat frequency oscillator) machine. With the invention and development of the ...

8. Bertrand's box paradox - Wikipedia

   en.wikipedia.org/wiki/Bertrand's_box_paradox

   Bertrand's box paradox: the three equally probable outcomes after the first gold coin draw. The probability of drawing another gold coin from the same box is 0 in (a), and 1 in (b) and (c). Thus, the overall probability of drawing a gold coin in the second draw is ⁠ 0 / 3 ⁠ + ⁠ 1 / 3 ⁠ + ⁠ 1 / 3 ⁠ = ⁠ 2 / 3 ⁠.

9. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, knowing that standard 18-karat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.