hello and ? re weird bright yellow fuzz on pressure bar

[carlteplitski]

Have found that here in Canada on spinets, but don't recall the yellow 
color. Also, found
similar stuff on accordion bass machines, made in Germany .  Often 
wondered what
atmospheric condition produced this .   Thought it might have been humidity.

Carl / Winnipeg







David Nereson wrote:

> I've seen that many times also.  I'm sure it's the result of a 
> chemical reaction with the air or maybe with some polish or 
> mothproofing that was put on at the factory or who knows what.  
> Sometimes dissimilar metals cause deposits to form, either from 
> corrosion or electrolysis, but I'm not a chemist.  I doubt it's 
> harmful dust, just sitting there, but I wouldn't breathe it in.   
>     --David Nereson, RPT
>
>     -----Original Message-----
>     From: pianotech-bounces at ptg.org
>     [mailto:pianotech-bounces at ptg.org]On Behalf Of holly quigley
>     Sent: Wednesday, September 27, 2006 10:22 AM
>     To: pianotech at ptg.org
>     Subject: hello and ? re weird bright yellow fuzz on pressure bar
>
>
>     Hi everyone!
>
>     Been an associate member for a while, I work as a tuner/technician
>     full-time in GA... just usually too busy to keep up with the
>     mailing list. Was actually once on here, but deleted my email
>     account and can't find my old password - d'oh!
>
>     Anyway, I just have a really quick question - I've searched the
>     archives and even google, and no luck.
>
>     For the second time now in the past month, I have come across a
>     spinet (two separate ones in the past month), with a layer of this
>     weird almost neon-yellowish-greenish fuzz/dust coating the
>     pressure bars. The screws for the pressure bars are completely
>     clean and untouched - it looks like it has to be either some weird
>     chemical reaction, a fungus or mold (but on plain metal like that
>     - ??) or Idunno - was there ever a time when pressure bars were
>     coated in some kind of faux suede or something that would break
>     down? It actually looks almost like school-issued yellow chalk
>     coating them, but it's an even layer over the entire bar, and as I
>     said, the screws have none of this stuff on them. I'm a little
>     concerned because when you just barely touch this stuff the powder
>     just showers right off of it. I didn't have a mask or gloves at
>     the time, and I hope I don't have to worry about being exposed to
>     some kind of poisonous chemical residue resulting from a reaction
>     between the pressure bars and something in the air. The two pianos
>     appeared to be different makes - the one today was a Mehler & Sons
>     (I think - I might be screwing the name up), and the other was a
>     Mendelssohn spinet, both about 30+ years old.
>
>     Does this sound at all familiar to anyone? In this case, I'd be
>     more than happy to wind up sounding like a complete newbie dolt
>     who didn't recognize something completely harmless and common...
>
>     Thanks in advance!
>     -Holly Quigley
>

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