--- fenrir_co <
fenrir@...> wrote:
> > I'm just procrastinating on the part to recycle the ferric chloride,
> > most
> > likely for as long as I have fresh FC in the bottle.
> Recycle: buy 40 volume peroxide, put etchant inside a heat-proof
> container (a #2 plastic 5 or 2.5 gallon bucket) inside another
> container (another bucket), add very slowly while stirring. 32 oz
> peroxide per 2 gallons of etchant, divide quantity as needed. Watch
> for foamup and overheating. Add a cup of pool acid every two or three
> regenerations. Leave uncovered on a hot day to evaporate and
> re-concentrate, not a 100% necessary step.
nope, wrong:
you are NOT recycling ferric chloride! you are MAKING cupric chloride etchant
on the go on top of the dirty exhausted FC!
drop the used FC and use 'pure' CuCl. it's not so dirty and reasonably
transparent!
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