Hi.
You can use those 3% bottles. Left the mix to settle for -at least - 1 day.
Also, don't forget to keep all that dark brown deposits in the liquid.
They're Oxidized Fe, needed for regenerate the FeCL mix again.
When you're etching your board, you can heat (before etching) the mix
a bit, lets say, about 38 C°/100 F°.
I have a 10 years bottle. Still etching in about 15 minutes.
Regards
--
Hector
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