This solution should consist of equal parts water and vinegar. Vinegar is an acidic substance that effectively dissolves copper oxide without harming the rest of the board.
The HASL method, also known as harmonic ablation of scarless lesions, is a minimally invasive procedure that uses high frequency sound waves to remove tumors and other growths without leaving any visible scarring.
Over the years, the HASL process has undergone significant developments, making it one of the most preferred finishing techniques in PCB manufacturing.
However, it’s important to note that this green residue is actually normal for a copper-based PCB.
Green solder masks are the most commonly used in electronics manufacturing.
One popular alternative to solder mask is conformal coating. It is a thin protective film applied to the surface of a PCB to protect it from environmental factors such as moisture, dust, and chemicals.
