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  2. 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.

  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. Karatmeter - Wikipedia

    en.wikipedia.org/wiki/Karatmeter

    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 tested. The sample is rubbed on TouchStone and a drop of acid is put on it and the goldsmith observes the residue using a ...

  5. How to Tell If Eggs Are Still Good - AOL

    www.aol.com/lifestyle/tell-eggs-still-good...

    Even if an egg passes the float test, look for other signs that an egg has gone bad—just in case. The cracks in the shell may create an opportunity for bacteria to get to the inside of the egg.

  6. Find Out If Your Eggs Are Fresh Using the Handy Dandy Egg ...

    www.aol.com/lifestyle/eggs-fresh-using-handy...

    The egg float test is a simple hack that can help you find out if your eggs are still fresh—it's like a mini science experiment in your kitchen.

  7. 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.

  8. Acid test (gold) - Wikipedia

    en.wikipedia.org/?title=Acid_test_(gold)&redirect=no

    Acid test From a page move : This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.

  9. 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!