1. purity: silver with a silver content of 99.9% per thousand feet is also the highest purity standard of silver products stipulated in the current national standard "Regulations and Naming Methods of Precious Metals in Jewelry" (see GB 1 1887-2008). In international standards, pure silver refers to silver with a silver content of not less than 990‰.

2. Use: Foot silver is generally processed into bracelets, pendants, longevity locks and other silver ornaments, which has special significance in the manufacture of photosensitive materials. Thousand-foot silver is not suitable for making imitation platinum or k-gold inlaid jewelry, but it has the unique texture of making pure silver jewelry. The main material of Japanese wood grain metal is millipede silver. Its production technology is very interesting, artistic and decorative.