Boards {printed circuit}| can have copper conducting pathways on one side and holes into which to solder circuit elements to conductor on other side. Film emulsion can cover board, negative of desired pattern goes on, camera photographs board, and negative develops. Silver is on conductor pathways. Electroplating puts copper on board.
Board can have a copper layer and a film emulsion that resists acid. Negative goes on, camera photographs board, and negative develops. Acid etches copper away. Then emulsion washes away, leaving copper pathways.
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Date Modified: 2022.0224