{"product_id":"gold-test-needles-10k-14k-18k","title":"Gold Test Needles-Set Of Three-10K-14K-18K","description":"\u003cp\u003eGold test needles are an essential tool for jewelers performing acid-based karat testing. This set of three needles covers the most commonly encountered gold karats in jewelry: 10K, 14K, and 18K. Use these needles as reference standards when comparing acid reactions on a test stone to determine the karat of an unknown gold item.\u003c\/p\u003e\n\n\u003cp\u003eTo use, select the appropriate karat needle and rub or scratch it against a test stone. Make a second rubbing or scratch with the item to be tested directly alongside the needle mark. Apply a drop of testing acid across both marks and observe how each reacts. If both marks react identically, the item being tested likely matches the karat of the needle used. If the test item dissolves faster, it may be a lower karat; if it dissolves more slowly, it may be a higher karat.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Acid-based gold testing is subjective by nature and requires careful observation and consistent practice to produce reliable results.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSet of three gold test needles covering 10K, 14K, and 18K\u003c\/li\u003e\n  \u003cli\u003eDesigned for use with acid testing on a test stone\u003c\/li\u003e\n  \u003cli\u003eProvides side-by-side comparison marks for accurate karat evaluation\u003c\/li\u003e\n  \u003cli\u003eUseful for identifying whether an unknown item is a higher or lower karat than the reference needle\u003c\/li\u003e\n  \u003cli\u003eSuitable for professional jewelers, appraisers, and metalsmiths\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eContents\u003c\/th\u003e\n\u003ctd\u003e3 test needles\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eKarats Included\u003c\/th\u003e\n\u003ctd\u003e10K, 14K, 18K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eProp 65\u003c\/th\u003e\n\u003ctd\u003eContains Lead and Phthalates — California Prop 65 warning applies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10K gold test needle\u003c\/li\u003e\n  \u003cli\u003e14K gold test needle\u003c\/li\u003e\n  \u003cli\u003e18K gold test needle\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Otto Frei","offers":[{"title":"Default Title","offer_id":43581743464662,"sku":"156.704","price":60.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/gold-test-needles-set-of-three-10k-14k-18k-otto-frei.jpg?v=1719957416","url":"https:\/\/www.ottofrei.com\/it\/products\/gold-test-needles-10k-14k-18k","provider":"Otto Frei","version":"1.0","type":"link"}