Web18 jun. 2016 · Ideal for use with test stones and testing solutions to determine contents of precious metals Set of 5 test needles includes: 10k, 14k, 18k, 22k and 999 Can be used to determine contents of gold and other precious metals Needles come on a convenient ring Convenient for workspace or on-the-go testing Additional Details Small Business Web18 dec. 2016 · The test acid used with the above needles is composed of 98 parts nitric acid, of specific gravity, 1.34, 2 parts hydrochloric acid, sp. gr. 1.17, and 25 parts of distilled water. The acid is kept for use in a low glass bottle, with a long tapering stopper, which nearly touches the bottom. (Fig. 27.)
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