Chinkin

Shinkin is one of the decorative techniques of lacquerware.
A pattern is cut with a knife against the lacquered surface, and gold foil and gold powder are pressed into this mark. It was once performed in China, Thailand, India, etc., but it is the most popular in Japan today, and it is a technique that is often used especially in Aizu and Wajima. In some cases, pigments may be embedded in place of foil or gold powder. Also, if you do not embed anything as it is carved, it says "moment carving" without saying "Shingane".
Link.
Wajima Lacquer
Chinkin