VERDIGRIS IS COPPER CORROSION ( Thanks also, Jurgen. )

[gordon stelter]

--- Piano Forte Supply
<pianoforte@pianofortesupply.com> wrote:

> 
> There are two types of center pins used today that I
> am aware of: nickel 
> plated brass and German silver.
> Brass is composed of copper (56 - 67%) and zinc. 
> German silver is 
> composed of copper (46 - 66%), zinc (9 - 42%) and
> nickel (8 - 36%).  As 
> I see it, there is no getting past copper as a
> component in center pins.
> 
> On many old pianos the verdigris is probably due to
> lubricants and 
> enviromental factors over the centuries.  As well,
> the thin plating may 
> have worn, leading to exposure of pure brass to the
> bushing.  I am 
> talking about flanges that weren't dipped in a
> "preservative" like so 
> many of the old Steinways.  I believe on these
> actions, one can get very 
> good results by rebushing the flanges.  A lot of
> work, no doubt, but the 
> only way to go if parts can't be had.
> 
> A great help in rebushing whole rails is the use of
> the European style 2 
> foot long center pin wires.  Rebushed flanges can be
> strung up on these 
> for the glue drying/bushing shrinking/sizing steps.
> 
> Jurgen Goering
> Piano Forte Supply
> 
> >
> >VERDIGRIS is an oxidation of COPPER without COPPER
> it
> >CAN NOT EXIST!!!!! In the felt, or the pin.
> Probably
> >the pin. So what is the composition of pins today,
> so
> >that it can't arise. SIMPLE QUESTION!
> >     Thump 
> >
> >  
> >
> 


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