Looks like there is a new DIY PCB Etching Solution. If you have some Hydrogen Peroxide, Distilled White Vinegar and Salt you are ready to give it a try.
“Vinegar – Distilled White Vinegar – diluted with water to 5% acidity (Meijer)
Hydrogen peroxide is what we call an oxidizing agent (a mild one), meaning that it easily accepts electrons from other species to form H2O (hydrogen peroxide itself is electron deficient). What happens when it “dissolves” copper metal is that a neutral copper metal atom releases two electrons, to form a Cu2+ ion in solution. All metals tend to release electrons to form positively charged species….we refer to anything that DONATES electrons as a reducing agents. The strength of metals as reducing agents varies and copper is a fairly weak reducing agent.”
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