Cleaning copper
2002-03-03 by Russell Shaw
Hi all,
To make spray-on prp resist work well, the copper has to be cleaned
well. Some things that work: salt and vinegar, salt and lemon juice,
citric acid, and probably lots of others.
I like citric acid the best, as its ok to use in the kitchen.
Mix up 30-50% powdered citric acid (sold in supermarkets), with
hot water until disolved. Wiping it over the pcb blank with paper
towel is sufficient to degrease it, without any harsh scrubbing needed.
To make spray-on prp resist work well, the copper has to be cleaned
well. Some things that work: salt and vinegar, salt and lemon juice,
citric acid, and probably lots of others.
I like citric acid the best, as its ok to use in the kitchen.
Mix up 30-50% powdered citric acid (sold in supermarkets), with
hot water until disolved. Wiping it over the pcb blank with paper
towel is sufficient to degrease it, without any harsh scrubbing needed.