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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. Metallurgical assay - Wikipedia

    en.wikipedia.org/wiki/Metallurgical_assay

    A model of a late 19th-century Canadian seal used to certify the quality of assayed gold. 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.

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    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.

  6. Acid test - Wikipedia

    en.wikipedia.org/wiki/Acid_test

    An acid test is a qualitative chemical or metallurgical assay utilizing acid. Historically, it often involved the use of a robust acid to distinguish gold from base metals . Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.

  7. Screen-printed electrodes - Wikipedia

    en.wikipedia.org/wiki/Screen-printed_electrodes

    On the other hand, as mentioned above, the most commonly used inks are silver and carbon, therefore, their printing and manufacturing characteristics should be highlighted: Silver ink. This ink acts as a conductor, while the working electrodes are printed mainly with graphite inks, although gold, platinum and silver inks are also used. Some ink ...

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