1This touchstone is used to verify the gold content in items 2Apply a drop acid test on touchstone, real gold will stay on the touchstone, fake one will be dissolved or oxidized to blue 3This solution works for testing any gold which you believe to be 10K, 14K, 18K, 22-24K, silver, and platinum pure 4Acid changes color based on purity. Very easy to use 5Ideal for testing jewelry, coins, antique gold, silver, platinum collectibles
