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

[Mark Cowan <toolontop@yahoo.com>]

Never have seen anything with obvious color beyond
grey when testing Pyrex intended for mirrors.  A Pyrex
beaker - that's entirely different. ;)

Mark

--- Jan Bentz <jbentz@inreach.com> wrote:
> 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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