The Clarinet BBoard  
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Author: Chezyy  
Date:   2020-02-26 00:21 
 I clean my instrument daily. Swab it out and everything. Today when I took the two joints apart, I noticed some black buildup in between. It was a powder-like substance. It scraped off easily. What is it? 
 
Hello!
  
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Author: Paul Aviles  
Date:   2020-02-26 01:39 
 Sounds like it could be shellac.   Wurlitzer utilizes a coating of shellac inside the bore of their horns which is to be removed by the factory after the first year. 
 
 
Other manufacturers use a healthy amount of stain to make there instrument bodies appear darker. 
 
 
I assume it's something along those lines.  Chris P. may have better insight into this. 
 
 
 
 
 
 
............Paul Aviles 
 
  
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Author: Chris P  
Date:   2020-02-26 19:01 
 What make and model is your clarinet?  
 
Do you leave it assembled for long periods? 
 
Former oboe finisher  
Howarth of London 
1998 - 2010 
 
Independent Woodwind Repairer  
Single and Double Reed Specialist 
Oboes, Clarinets and Saxes 
 
NOT A MEMBER OF N.A.M.I.R. 
 
The opinions I express are my own.
  
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Author: Tobin  
Date:   2020-02-26 23:52 
 It could just be the buildup of cork grease and whatever moisture is there when you put it away. 
 
My Wurlitzers haven’t shown any sign of the shellac from flaking yet, and I’m about to hit three years with them. 
 
James 
 
Gnothi Seauton
  
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Author: Paul Aviles  
Date:   2020-02-27 00:59 
 Oh,  you really should have that polished out.  It is there only to get the wood through the first year. 
 
I learned about this years after selling mine that I used "as-is" for 12 years! 
 
 
 
.............Paul Aviles 
 
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