Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. First check the circuit board is transferred intact, if not transferred few good places you can use black oil pen repair. Then it can corrode, and so when the copper film is completely exposed circuit board is etched, the etching solution is removed from the board clean, so a circuit board on corrosion better. The composition of the etching solution of concentrated hydrochloric acid, concentrated hydrogen peroxide, water, a ratio of 1: 2: 3, in the preparation of the etching solution, first turn on the water, coupled with concentrated hydrochloric acid, concentrated hydrogen peroxide, if the operation of concentrated hydrochloric acid, concentrated hydrogen peroxide or an etching solution does not CAUTION splashed on skin or clothing should be promptly cleaned with water, due to the use of highly corrosive solution, must pay attention to safety when operating. 

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