4 New Silver and Gold Testing Acid and Needles 4 Silver and Gold Test Acids This is a new set of silver and gold testing acids. These are the finest acids made today. Sturdy plastic bottles maximize safety and allow the user to easily squeeze out a drop at a time. You receive: One 1/2oz bottle of 10k testing acid One 1/2oz bottle of 14k testing acid One 1/2oz bottle of 18k testing acid One 1/2oz bottle of silver testing acid Due to testing acid being classified as a hazardous material it cannot be shipped by air and can only be shipped to the lower 48 states. Acid Test Needles This is a new set of acid testing needles to test 10k, 14k, and 18k gold These are used to determine karat content of gold The needles and the item to be tested are rubbed on a test stone and treated with acid to determine a match