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2. 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.

3. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   Due to its very high precision and fast result, X-ray analysis has been adopted by international agencies in India as part of the certification process used to hallmark gold. [1] It is an accurate, non-destructive means of testing the purity of gold and other related elements. Analyzing gold using XRF spectrometers gives the purity of gold, up ...

4. 5 Amazon Items That Have a Lot of Customer Complaints - AOL

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5. Criticism of Amazon - Wikipedia

   en.wikipedia.org/wiki/Criticism_of_Amazon

   As customer reviews have become integral to Amazon marketing, reviews have been challenged on accuracy and ethical grounds. [358] In 2004, The New York Times [359] reported that a glitch in the Amazon Canada website revealed that a number of book reviews had been written by authors of their own books or of competing books. Amazon changed its ...

6. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   24-carat gold is pure (while 100% purity is very difficult to attain, 24-carat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-carat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-carat gold is 12 parts gold (12 parts another metal), and so forth. [20]

7. Gold Prices May Suffer Amid Complaints About Coin Scams

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8. The AncestryDNA Genetic Test Kit Is Currently At Its Lowest ...

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9. Amazon Vine - Wikipedia

   en.wikipedia.org/wiki/Amazon_Vine

   The silver tier allows members to request up to three items per day from products valued at $100 or less. To be upgraded to the Gold tier, members must review at least 80 Vine items and 90% of their Vine orders within the six month evaluation period set by Amazon. Gold tier members can request up to eight items per day from products of any value.