"JG" > wrote in message
. net...
> Lum Eisenman wrote:
> > "Ric" > wrote in message
> > ...
> >> Are you real sure of the numbers, Lum? I don't have my chem texts with
> >> me right now - will check tomorrow - but 3 ppm of copper sulfate sounds
> >> pretty high --- anyone know the 'safe' limits of CuSO4? I thought it
was
> >> in the neighborhood of something less than 1 ppm.
> >>
> >> Personally, I wouldn't want to drink wine with anything like 'too much'
> >> CuSO4 in it.
> >>
> >> At the very least - JG might want to consider bentonite fining the
wine
> >> in the hope of dropping some copper ions?
> >>
> >>
> >>> Don't dump that wine yet Joe.
> >>> The label on my jar of vitamins says........"each tablet contains 3
> >>> milligrams of copper (150% of the minimum daily requirement)." If
your
> > wine
> >>> contains 3 milligrams of copper per liter, one 750 liter bottle of
wine
> >>> would contain 2.25 milligrams of copper or just about the MDR of
copper.
> >>> I would drink the wine. But, I would make sure I didn't drink more
than
> > 3
> >>> or 4 bottles per day.
> >>> Lum
> >>> Del Mar, California, USA
> >>> www.geocities.com/lumeisenman
> >
> > I am NOT real sure of the numbers Rick.
> > I am sure of the quote from the label on my vitamin bottle.
> > I am also sure that Bentonite will not remove any significant amount of
> > copper from wine. But, fining with dry yeast can reduce the copper
content
> > of wine considerably.
> > Lum
> >
> >
> Lum,
> Can you outline the procedure for removing copper with dry yeast?
>
> Thanks,
> Joe

The procedure is very simple Joe.

Add dry yeast to the wine, stir, rack the wine off the yeast lees after a
week or two.

Apparently, the metal ions adhere to the yeast sell membrane and are removed
when the wine is racked off the yeast lees. Old (dead) yeast seems to be as
good as fresh yeast, so I always save any old yeast just in case I need it
to remove metal ion. I have used as much as 50 grams of dry yeast per
5-gallons of wine.

Lum
Del Mar, California, USA
www.geocities.com/lumeisenman