![Immersion copper/black hole/black shadow process, which one should I choose for PCB?](https://arisentecpcb.com/wp-content/uploads/2023/09/Immersion-copper.jpg)
Immersion copper / black hole/black shadow process, which one should I choose for PCB?
Since Paul Eisner officially invented PCB manufacturing technology in 1936, more than 80 years have passed, PCB has developed rapidly and has become an indispensable