Gold Test Acid Kit 10K, 14K, 18K, 22K And Stone Tools 4 Bottles of Testing Acid. This is a new set of 4 bottles of testing acid. Each bottle contains 1/2 fl oz of acid. Sturdy plastic bottles maximize safety and allow the user to easily squeeze out one drop at a time. You receive: One bottle of 10 karat gold testing acid. One bottle of 14 karat gold testing acid. One bottle of 18 karat gold testing acid. One bottle of 22 karat gold 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, 22K and silver. Use this stone with acid solutions. It measures approximately 1 7/8" x 1 1/2" x 1/4" (48 x 37 x 6 mm).