Depending on its purity, a gold alloy will react differently with the acid. Using a Gold Testing Kit. - Acids - Gold testing needles with gold tips used for comparison with test pieces. SIMPLE TESTS. Scratch a 1 inch line on the black test stone. When buying silver or gold on ebay, make sure that they don't use a postal scale as they are not … At the bottom of this page is a list of related articles. If there … Always start with the Quicktest 9ct acid (the 'WHITE' acid), apply it to the article as described in the instructions, this will tell you if the metal is not gold, 9ct gold or better than 9ct; once you know that it's better than 9ct, move onto the 14-24ct acid (the 'BLUE' acid). Density will certainly give it away, and gold density testing is one of the simplest tests around. Kathleen Winkler began her writing career as a junior writer for the Putnam mutual fund group. Trending On Web: How to Check Purity of Gold? Acid Test. The piece being tested is scratched against a testing slab so as to leave a scratch mark on it. Step 2 Hold a … Glass. Procedures For Testing Gold, Platinum & Silver Using A Gold Testing Acid Kit: To test for the karat value of gold, platinum and silver, you will need the following materials and tools: - Black acid testing Stone that is washed thoroughly with water prior to each test. Like many simple tests, this method cannot precisely determine metal purity, but it can be used to categorize a sample into a purity range. Testing gold by its sound The ‘ping’ test, as this is commonly known, allows us to tell if a coin is made from real or fake gold by listening to the sound it makes when struck. If applied directly to a coin or bar, testing solutions will dull the finish and leave an unsightly mark. All you have to do is make a slight scratch on the surface and add a small drop of trioxo nitrate (v) acid (HNO3). Possibly, since there are metals beside gold that are resistant to acid. Ignacio Lopez/Demand Media . Precious metals will make a long, high-pitched ringing sound when struck as opposed to base metals, whose respective sounds will be duller and much shorter. Concurrently, chloride ions resulting from the separation of HCl into its components combine with the newly oxidized gold to form chloraurate ions, or AuCl4-. A pinkish cream color indicates gold plate on … 90 to 100% silver, the acid will show a creamy color. Balancing your coin on the end of your finger and tapping it with another coin … Measured strengths of nitric acid are used to test for 14k and lower. Nitric acid is the type of acid generally used, and you drop the acid onto a part of the piece where there is some wear. Advertisement. All above Gold Testing items are available from Star Struck, LLC as part … There are easy ways to test jewelry yourself and thus eliminate the need for a professional appraisal. Testing systems vary in price from modest to high, but they will allow you to test the purity of gold you own. When sodium chloride (table salt) is added, the silver nitrate is converted to silver chloride, which has a … Investors can purchaseinexpensive acid test kits for gold and silver. Watching the color change in a drop of acid can reveal whether or not a sample is genuine. Step 1. If there is no wear then make a small file cut. The main objection to it is the cost of the acid. A touchstone kit for testing gold alloys is simple to use, inexpensive and non-destructive. The test depends upon the solubility of the addition metals and the stability of gold in warmed, concentrated nitric acid. So, if gold jewelry is 14K, it is 14 out of 24 parts gold, or 58.33 percent gold. Apply a drop of #1 solution. If there is any stuck-on dirt or grease, get the wash cloth wet and scrub it off. 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