[Leica] OT: Yellow gone gone gone

[kanner at acm.org (Herbert Kanner)]

Thanks for the kind word, George. Byron Rakitzis suggested that my 
speculation as to the cause of the yellow was probably incorrect, and 
suggested a Google search. I found a lot of information indicating 
that the yellow was due to radiation damage from gamma rays emitted 
by some of the daughter products of the decayed thorium. No 
information as to why a few hours application of UV cures this.

Herb


>On Apr 19, 2011, at 12:23 PM, Herbert Kanner wrote:
>
>  > So now I concluded that the balsam was fine, and that this lens
>had at least one thorium glass element. I headed to Ikea, where I
>had never been before. I felt like a lab rat in a maze; everyone
>should have that experience ONCE. By some miracle I found a desk
>version of that lamp $9.89, assembly required! I applied the
>recommended twelve hours of exposure, and the yellow is gone gone
>gone.
>
>
>Kudos! Herbert.
>and thanks for the detailed and useful information.
>
>Regards,
>George Lottermoser
>george at imagist.com
>http://www.imagist.com
>http://www.imagist.com/blog
>http://www.linkedin.com/in/imagist
>
>
>
>
>
>
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-- 
Herbert Kanner
kanner at acm.org
650-326-8204

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