[Dixielandjazz] Re: Cryogenic treatment for brass

[Mike C.]

Is that why over time a brass instrument plays sweeter? I have a 1956 
Conn 6H trombone that plays just wonderfully.

Mike

Robert Smith wrote:
> As a metallurgist I regard cryogenic treatment as highly unlikely to relieve any residual stress in any metals or alloys. Sress-relieving ('tempering') is done by increasing the temperature. Room temperature also relieves residual stresses, but usually takes a long time (depending on the metal or alloy). Lead for example tempers rapidly at room temperature, whereas brass takes several decades before the effect is noticeable.
> It would be impracticable to stress-relieve musical instruments because the temperature involved would damage non-metallic parts including the lacquer.
> 
> Cheers
> 
> Bob Smith
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