DJ,
I mixed it immediately before using from sealed containers. When you
mix the 4 L, do you keep it in an airtight (covered) etching tank, or
do you pour it into a container and then back into the etching
chamber when you want to etch a board? Do you mix it in the same
proportion I do - 3 HCl +3 H2O + 1 H2O2?? Thanks!
Mark
At 04:36 PM 3/18/2010, you wrote:
>By "Fresh" I meant how long since you'd mixed them. As for amount, I
>mixed up four liters of etchant and just keep reusing it :-)
>
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