Thomas wrote
> So you are saying that some older radioactive-glass
> lenses may go yellow, while others of about the same
> age will not?
>
> What do you or other list members think would
> contribute to that? Exposure of them to daylight? Just
> different batches of glass used? Random occurrence?
In another photo list I'm on, recently there was an interesting discussion
about the yellowing of such lenses.
The yellow colour will vanish if the lens is given exposure to UV light, and
there was talk of "black" UV light sources as well as sunlight.
Brian
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