Many thanks to Master Li's selfless tutorial guidance. 1. Use a 10X magnifier to check if the tiny cracks inside the objectives were infringed with the dye mark, 2. Soak objectives in diiodomethanone, a chemical solution, to test if their relative density is 3.33, and 3. The perfect size scale of oval shape is 3:2:1 for Fei-Cui main stone.
Many thanks to Master Li's selfless tutorial guidance.
1. Use a 10X magnifier to check if the tiny cracks inside the objectives were infringed with the dye mark,
2. Soak objectives in diiodomethanone, a chemical solution, to test if their relative density is 3.33, and
3. The perfect size scale of oval shape is 3:2:1 for Fei-Cui main stone.
我真是外行人，但是竟看出2號是真的，1號太假了，三號還來不及看。
中間是老坑嗎?
Marem
主持人是要再婚嗎？穿得那麼俗