6 New Precious Metal Tools 3 Testing Solutions. This is a new set of 3 testing solutions. Everything you need to appraise 10k, 14k, 18k and 22k. These are the finest acids made today. Each bottle has 1/2 fl oz of acid. The sturdy plastic bottles maximize safety and allows the user to easily squeeze out one drop at a time. You receive: One bottle of 10k testing acid. One bottle of 14k testing acid. One bottle of 18k 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 Stone. This is a new acid testing stone. This stone is used to test 10k, 14k, 18k and silver. Use this stone with acid solutions. It measures approximately 1 7/8" x 1 7/8" x 3/16" (47 x 47 x 5 mm). This stone will not fit in the box. Acid Test Needles. This is a new set of testing needles. These needles test 10k, 14k and 18k. These are used to determine karat content of gold and silver. The needles and the item to be tested are rubbed on a test stone and treated with acid to determine a match. Wooden box. This is a new wood box. It is used to store up to 3 acids. It measures approximately 51/4" x 2 7/8" x 4" (133 x 72 x 101 mm).