gold testing stone Practical Test Kit Silver Platinum Gold Testing Touchstone Jewelry Tool Set Drop shipping

Features: 1. This touchstone is used to verify the gold content in items. 2. Apply a drop acid test on touchstone, real gold will stay on the touchstone, fake one will be dissolved or oxidized to blue. 3. This solution works for testing any gold which you believe to be 10K, 14K, 18K, 22-24K, silver, and platinum pure. 4. Acid changes color based on purity. Very easy to use. 5. for testing jewelry, coins, antique gold, silver, platinum collectibles. Specification: Condition: 100% Brand New Item Type: Touchstone Material: Stone grey or black in fact are same , when the black stone be dry it will be grey color Note: Size for manual measurement, there may be a 0 to 0.7 cm error, belongs to the normal phenomenon. stone send in randomly color black or grey Package List: 1 * Touchstone (Acid Testing Water Not Included)