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. Ideal for testing jewelry, coins, antique gold, silver, platinum collectibles. Specification: Condition: 100% Brand New Item Type: Touchstone Material: Stone Color: As Shown in the Picture Weight: Approx. 55-65g Optional Type: Common, Superior (Small) Package List: 1 * Touchstone (Acid Testing Water Not Included)

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

Item Dimensions LxWxH: 3.07 x 1.77 x 0.31 inches. Color: Common. Brand: Semme. Batteries required: No. Best Sellers Rank: #122,068 in Arts, Crafts & Sewing. Customer Reviews: 4.1 4.1 out of 5 stars 38 ratings 4.1 out of 5 stars. : B07LD9F2W4. Manufacturer: Semme. Item Weight: 1.41 ounces. Product Dimensions: 3.07 x 1.77 x 0.31 inches.