[Dixielandjazz] Re: Cryogenic treatment for brass

[Robert Smith]

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