How can I know the front and back of copper coins in a ceramic bowl in advance?

It's not easy to see, whether it's a cup or a bowl or something else, you need high-tech tools to see the objects inside. There are several ways to know the front and back of copper coins in ceramic bowls in advance:

1. light inspection: use a suitable light source, such as strong light or flashlight, to illuminate the edge or bottom of the bowl and observe the surface details of copper coins. There are usually different concave and convex textures, patterns or characters on the front and back.

2. Touch: Gently touch the copper coins in the bowl with your fingers, and distinguish the front and back by touching. There may be more vivid patterns and bumps on the front.

3. Use tools: If you want to see the details of copper coins more clearly, you can use a magnifying glass or microscope. Pointing a magnifying glass or microscope at copper coins and carefully observing patterns and characters are helpful to judge the pros and cons.

4. Information inquiry: If you have relevant information about copper coins, such as the year, dynasty or specific pattern of copper coins, you can refer to relevant information to inquire about the positive and negative styles of copper coins in that dynasty.

Please note that these methods may require some experience and skills. In addition, when observing, touching and handling antiques or items of historical value, we must be careful to avoid damage.