Part 4/10:
Etching Process and Chemical Safety
A critical part of his process involved etching the copper surfaces. Initially, he used vinegar and salt—common, accessible chemicals—to etch the plates slowly. Recognizing the need for faster results, Paul prepared a stronger etching solution using muriatic acid (hydrochloric acid) mixed with hydrogen peroxide to accelerate the process.
Safety precautions were paramount:
Full face shields and N95 masks were used to protect against hazardous fumes.
PVC-coated gloves and protective clothing shields were donned to prevent burns and chemical contact.
The entire process was conducted outside to avoid fumes accumulating indoors.