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ACID TEST KIT - 3 ACIDS - 4 NEEDLES - STONE
Precious metals acid tester kit for 10ct, 14ct, 18ct gold with testing stone and testing needles in a wooden box. Scratch your know gold and the test piece on the stone, place a drop of acid on each and if the reaction is the same the metal is the same. 10ct acid will work for 9ct as well.