1、This product is used to verify metal products that contain gold in the item. 2、Apply a drop of this solution to the small sample to be tested, the real gold will stay on the litmus test stone and the fake will be dissolved or oxidized to blue. 3、This solution is suitable for testing any metal product that you think is 10K, 14K, 18K, 22-24K whether it contains gold or not. 4、Very easy to use, instructions included. 5、Ideal for testing jewelry, coins, antique gold, silver, platinum collectibles and other items to see if they contain gold. Features: 1. This product is used to verify metal products that contain gold in the item. 2. Apply a drop of this solution to the small sample to be tested, the real gold will stay on the litmus test stone and the fake will be dissolved or oxidized to blue. 3. This solution is suitable for testing any metal product that you think is 10K, 14K, 18K, 22-24K whether it contains gold or not. 4. Very easy to use, instructions included. 5. Ideal for testing jewelry, coins, antique gold, silver, platinum collectibles and other items to see if they contain gold. Specification: Condition: Brand New Item Type: Acid Testing Water Material: Glass + Liquid Color: As Shown in the Picture Size: Approx. 1.2 * 3 * 4.7cm / 0.47 * 1.18 * 1.85inch Weight: Approx. 20g Package List: 1 Bottle of Acid Testing Water (Touchstone is Not Included) Note: 1. Don't let it touch your skin. If it gets on the skin, rinse the burn area with water. It will be better to soak or rinse with weak alkaline solution such as soapy water or soda water if they are available. 2. Don't soak or rinse with strong alkaline solution because it has strong oxidizing and corrosive properties. 3. Touchstone is not included.