How to sign Shou Ziwen Gold ingot?

1. Observe the color of the gold ingot: the color of the gold ingot should be golden and bright, with heavy patina.

2. Observe the word "shou" on the gold ingot: the word "shou" on the surface is natural and appropriate, with obvious style and clear seal.

3. Observe the shape of the gold ingot: the shape of the gold ingot is regular, the whole ingot is boat-shaped, the bottom is sunken, and the word "pure gold" is printed inside.