anything acidic, vinegar I recently heard coffee.....ferric is not expensive find a radio shack and tell them you want PCB etchant....1 bottle is about 10$ go get a bottle of disteled water maybe 2 bucks....take the ferric and pour it into a container then fill that bottle up with the distilled watter pour it in one more bottle of watter so maybe 12-13 buck....there is nothing that is going to be crazy cheap ....you still have to buy the vinegar or what ever else....don't use tap water it will junk up the etch
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