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I started by adding the pins to a 3 litre plastic bottle and covered them with 20% hydrochloric acid.
Then I added 100ml 3% H2O2 and begun aerating the liquid using an aquarium pump.
I added concentrated hydrochloric acid to put the cuprous chloride back in solution.
I decided to use two strainers, one fine and one ultra fine.
I put the beaker on a hotplate and waited for all the foils to dissolve.
Then I decanted the hydrochloric acid and re-dissolved the precipitate in 20ml aqua regia.