Re: [ATM] 'Commercial' annealed, rather than 'fine' annealed

[Jan Bentz <jbentz@inreach.com>]

On the question of quantifying what is seen in a polarizing strain test 
 there is a method that uses the coloring of  the field under crossed 
polaroids.  Colors seen in the order of  black at zero, violet, 
 grey-lavender, yellow, orange-red, red indicates increasing strain up 
to about .6 micron  retardation.  What we would be concerned with is 
coloring in the black to grey-lavender range,  the rest  shows strain 
beyond what  would be encountered in astronomical optics.  I'm doing 
this from memory so somebody should find out for sure.

Jan Bentz

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