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2. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   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 agencies in India as part of the certification process used to ...

3. Test strip - Wikipedia

   en.wikipedia.org/wiki/Test_strip

   A test strip is a band/piece/strip of paper or other material used for biological testing. Specifically, test strip may refer to: Food testing strips; Glucose meter test strip; Lipolysis test strip; Urine test strip; Universal indicator pH test strips; It may also refer to: Teststrip, an art gallery in Auckland, New Zealand

4. 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.

5. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, a gold alloy of 127 ⁄ 128 fineness (that is, 99.2% purity) could have been described as being 23-karat, 3-grain, 1-quart gold. The carat fractional system is increasingly being complemented or superseded by the millesimal system, described above for bullion, though jewelry generally tends to still use the carat system.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. BIS hallmark - Wikipedia

   en.wikipedia.org/wiki/BIS_hallmark

   The BIS system of hallmarking of gold jewellery began in April 2000. The standard specifications governing this system are IS 1417 (grades of gold and gold alloys, jewellery/artefacts), IS 1418 (assaying of gold in gold bullion, gold alloys and gold jewellery/artefacts), IS 2790 (guidelines for manufacture of 14, 18 and 22 carat gold alloys only ), IS 3095 (gold solders for use in manufacture ...

8. Electroscope - Wikipedia

   en.wikipedia.org/wiki/Electroscope

   The gold-leaf electroscope was developed in 1787 by British clergyman and physicist Abraham Bennet, [4] as a more sensitive instrument than pith ball or straw blade electroscopes then in use. [11] It consists of a vertical metal rod, usually brass, from the end of which hang two parallel strips of thin flexible gold leaf.

9. Serum-separating tube - Wikipedia

   en.wikipedia.org/wiki/Serum-separating_tube

   These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level.