Re: [ATM] How to test a mirror blank?

[Dale Eason <atmpob@yahoo.com>]

That may work, however I once pointed an IR
thermometer at the sun and was surpirsed to discover
that it was about 65 deg F on a warm summer day.  That
is when I realized that the sun emits very little IR I
think the sun emits much higher frequency radiation. 
What I was measuring was the sky temp.

Dale Eason

--- Ken Hunter <atm_ken_hunter@yahoo.com> wrote:

> Aaron,
>    
>   Fused Quartz is invisible to IR. Set it in the sun
> besides a known comparable blank of Pyrex etc. The
> Quartz blank will remain cool to the touch while the
> Pyrex etc will increase in temp dramatically
> compared to the quartz.
>    
>   Ken Hunter
> 
> Aaron L Taylor <lists@subgeniuskitty.com> wrote:
>   Do you guys have any more reliable methods to
> verify what this is 
> made out of? Are there any other glasses that could
> have a similar color 
> that I should know of?
> 
> Thanks,
> -Aaron Taylor
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