Klarinet Archive - Posting 000145.txt from 2010/09

From: "Bill Hausmann" <bhausmann1@-----.net>
Subj: Re: [kl] Vulcanized rubber mpc deterioration - chemistry
Date: Tue, 07 Sep 2010 19:50:04 -0400

Pretty much, yes. The sulphur is IN the rubber, added to it in the
vulcanization process (see Charles Goodyear). The heat seems to cause it to
leach out on the surface. It can be buffed off, but it might easily cause
more damage than the discoloration does.

Bill Hausmann

If you have to mic a saxophone, the rest of the band is TOO LOUD!

> What I want to know is what on earth makes rotting mouthpieces green
> or tan? It is certainly not melanin that makes our skin darken in the
> sun (as mentioned in the post comparing ligature shadow on the mp).
> Is it a difference in composition of the rubber or a matter of
> diffraction caused by little particulates that form on the surface
> (like cracking in the outside of a rubber band). Rubber bands don't
> really change color when they decay; instead, they darken. Maybe the
> vulcanized rubber is photobleaching?
>
> -Jennifer

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