Turquoise is easy to lose water due to more pores, which makes its luster and color dull, not as beautiful as before. In order to deepen the color of turquoise, people often dip turquoise into wax. Националният стандарт GB/T 16552 "Имена на бижута и нефрит" stipulates that the immersion wax of turquoise is not [...]
