Features:
1. This touchstone is used to check the gold content of objects.
2. Apply an acid drop test on the touchstone, real gold will stay on the touchstone, a scythe will be dissolved or oxidized to blue.
3. This solution works to test any gold you believe to be 10K, 14K, 18K, 22-24K, pure silver and platinum.
4. The acid changes color depending on the purity. Very easy to use.
5. Great for testing jewelry, coins, antique gold, silver and platinum collectibles.
Specification:
Condition: 100% brand new
Item type: Stone fingerboard
Material: Stone
Color: As pictures shown
Size: S, L (optional)