Read 1 answer by scientists to the question asked by shanti kumari on may 17, 2022 Podmieńcie ten plik po wgraniu spolszczenia, żeby mieć działające polskie znaki I bought a bottle of pcb etchant for $9.00 at radio shack which is ferric chloride and hydrochloric acid
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This solution has been quite helpful in removing the copper out from under the gold plating on circuit board fingers
According to what i've been reading the solution reduces copper metal.