5 New Precious Metal Tools 3 Testing Solutions. This is a new set of 3 testing solutions. Everything you need to appraise 10k, 14k and 18k. 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 2" x 1 1/2" x 1/4" (50 x 37 x 6 mm). This stone will not fit in the box. 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).