Generally speaking, people use green because green is very irritating to the eyes, and the manufacturing and maintenance personnel are not easy to fatigue after working on the PCB for a long time, and the damage to the eyes is also very small. There are also common colors, yellow, black and red. Paints of various colors are paints sprayed on the surface after manufacture.

       Another reason is that the common color is green, so the processing plant reserves the most green paint, so the cost of edible oil is relatively low. In the case of repairing the PCB board, it is easier to distinguish the difference between different wiring and white, while the correlation between black and white is difficult to identify. In order to more easily distinguish their product grades, each manufacturer will use two colors to distinguish high-end products and low-end products. For example, ASUS, which produces notebook motherboards, has a low-end yellow board and a high-end classroom blackboard. Biostar’s blue oil board is a high-end board, and the green oil board is a low-end board.

       At present, only the cost of black oil PCB is higher than other PCBs, but it does not mean that the performance of black oil PCB is stronger, but in manufacturing, black oil PCB has the largest difficulty coefficient for drilling, so the product qualification rate will be Relatively lower than other color PCB boards.