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Mark Bolsius markbolsius@optusnet.com.au
Thu, 30 Sep 1999 22:19:00 +1000


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>From: Del

> My next question...have you noticed any difference in performance, or
> tuning, or tuning stability that you could attribute to these differing
> bridge treatments?

Yes! Hi Del, Gina and Co

In bridges without treatment, I have noticed a higher than average tendency
for rust on the strings, specifically at the point of contact with the
bridge surface, and also on the bridge pins.

...I can't say categorically how much more than usual, I haven't recorded or
formally analysed the phenomenon, I suspect that the post mentioning the
graphite acting as a sealant could be onto something....there was a piano I
saw with chronic rusting (not an old instrument, maybe 8 years old)
localised at the bridge, the rest of the strings were fine, the piano was
not in an overtly humid environment and not close enough to the sea to be an
issue....short story....salt content in the wood in the bridge was
sky-high...the report that came back from the testing lab read "there's more
salt in this than I'd have on my fries!"

Does wood have a certain level of natural salt anyway? maybe this is why we
need to separate the wood and the string....?

I have a colleague that prefers to seal the bridge completely, after
notching then graphites and burnishes, pins and strings... he feels more
confident about the longevity of the bridge especially in tough
environments.

Cheers
Mark - I'll have wood salt on those fries thanks - Bolsius

We call fries "chips" here in Australia



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