Soundboard Stains-how to fix?

[gordon stelter]

To fix this I would recommend stripping the board and
sanding, and if this does not remove, bleach board
with oxalic acid.
     Thump
--- gordon stelter <lclgcnp@yahoo.com> wrote:
> Often soundboards were finished with shellac, an
> organic substance edible to roaches, crickets, and
> probably fungus, too. Especially in Florida. And it
> could be from household air contaminants ( cooking,
> smoking, bad breath ) or that something was spilled
> there, accelerating the culture and extending the
> stain into the actual wood.
>      Thump
> 
> --- Farrell <mfarrel2@tampabay.rr.com> wrote:
> > I have noticed a number of older piano soundboards
> > that have a portion of darker coloration (darker
> > brown) to them. The darker color appears as
> > streaks/blotches and does not follow grain, i.e.
> > this is clearly not a trasition to heartwood. I
> > trust this coloration was not present when the
> > instrument was new. It has the appearance of a
> > fungus-like development, but I really don't think
> > fungus is the culpret. Don't have a clue otherwise
> > though. Any thoughts?
> > 
> > Terry Farrell
> >   
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> 
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