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2. Tollens' reagent - Wikipedia

   en.wikipedia.org/wiki/Tollens'_reagent

   The diamine silver(I) complex in the mixture is an oxidizing agent and is the essential reactant in Tollens' reagent. The test is generally carried out in a test tube in a warm water bath. In a positive test, the diamine silver(I) complex oxidizes the aldehyde to a carboxylate ion and in the process is reduced to elemental silver and aqueous ...

3. 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 are assayed by an assay office.

4. Touchstone (assaying tool) - Wikipedia

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

   Drawing a line with gold on a touchstone will leave a visible trace. Because different alloys of gold have different colors (see gold), the unknown sample can be compared to samples of known purity.

5. 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.

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7. Argentometry - Wikipedia

   en.wikipedia.org/wiki/Argentometry

   In analytical chemistry, argentometry is a type of titration involving the silver(I) ion. Typically, it is used to determine the amount of chloride present in a sample. The sample solution is titrated against a solution of silver nitrate of known concentration. Chloride ions react with silver(I) ions to give the insoluble silver chloride:

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9. Should you test for STIs at home? Here's what experts say. - AOL

   www.aol.com/lifestyle/test-stis-home-heres...

   But having an at-home STI test available raises the odds that people will actually get tested — provided they can afford the test. The Simple 2 test, for example, costs $99 per kit, or just over ...