How to determine the authenticity of gold and silver coins?

1、 Copper or tin should be used to replace gold and silver, and then a layer of gold and silver powder should be coated on the outside. Such gold and silver coins often have errors in weight compared to those of the same volume, and the gold plating layer is easy to peel off.
2、 Adopting basic sandblasting techniques, resulting in rough and clumsy texture, low texture organization, and no sense of luxury and elegance.
3、 Insufficient carving experience resulted in the loss of embossing on gold and silver coin products, rough and clumsy strokes, and uneven exterior.
4、 Claiming to be a legitimate custom dealer for washing gold and silver coins, but unable to provide anti-counterfeiting techniques or patterns similar to genuine products.