10K, 14K, 18K, 22K Gold and Silver Test Acid Kit Tools 5 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. One 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. Also includes an economy Test Stone. This is a new acid testing stone. This stone is for testing 10K, 14K, 18K, 22K and silver. Use this stone with acid solutions. It measures approximately 1 7/8" x 1 7/8" x 1/4" (48 x 48 x 6 mm). FREE GIFTS: 5 Gram .999 Gold Clad Test Bar & 5 Grain .999 Silver Test Bar