Etching with Ammonium persulphate

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Joined: 11/02/2018
Location: Australia
Posts: 1459
Posted: 06:39am 31 Dec 2021      

Not sure what the optimum method is, but what has worked for me is make enough to cover the board to a depth of one or two cm and gently slosh back and forth until done. The amount needed in ml is the tank width x length x depth you fill it to, all in cm. You can reuse it a few times but it takes longer each time. Warming it to 50C helps.