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2. Touchstone (assaying tool) - Wikipedia

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

   The touchstone was used during the Harappa period of the Indus Valley civilization ca. 2600–1900 BC for testing the purity of soft metals. [2] It was also used in Ancient Greece. [3] The touchstone allowed anyone to easily and quickly determine the purity of a metal sample. This, in turn, led to the widespread adoption of gold as a standard ...

3. Gold vs. silver investing: Which is better when interest ...

   www.aol.com/gold-vs-silver-investing-better...

   Gold and silver are both precious metal assets worth investing in, but one could be a better bet right now. / Credit: Getty Images/iStockphoto Until recently, inflation had been high in the U.S.

4. Metallurgical assay - Wikipedia

   en.wikipedia.org/wiki/Metallurgical_assay

   A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods. Raw precious metals (bullion) are assayed by an assay office. Silver is assayed by titration, gold by ...

5. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   X-Ray based karat testing machine for gold purity testing. The Karatmeter is a scientific instrument which uses X-rays to give an exact reading of the purity of gold. The Karatmeter is also referred to as a X-Ray fluorescence (XRF) spectrometer. Due to its very high precision and fast result, X-ray analysis has been adopted by international ...

6. Gold is hovering near all-time highs. Here's how investors ...

   www.aol.com/finance/gold-hovering-near-time...

   Gold was hovering at a record high around $2,700 per ounce on Wednesday and silver was trading near 12-year highs, with the US presidential election between Kamala Harris and Donald Trump just ...

7. Why gold and silver are in the best environment for gains in ...

   www.aol.com/news/why-gold-silver-best...

   Layton's comments come amid a gold and silver rally, with the price of gold up 2.4% in the last month to trade at $2,749.10, and that of silver up 6.5% to $34.01.