PCB etching with household chemicals
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Vinegar – Distilled White Vinegar – diluted with water to 5% acidity (Meijer) Peroxide – 3% solution (Meijer) Salt – to taste.
Source & how to video: http://www.stephenhobley.com/blog/2011/03/02/still-messing-with-forces-i-dont-understand-the-formula/