Joao Ribeiro (jribeiro@greco.com.br)
Sun, 31 Jan 1999 10:40:54 -0200
Hi Ben,
I don't get it too!
The thing is how can a glass lens w/o uv protection fully protect my eyes?
I was told once that the common glass filters about 70% of UV but it still gets
a lot of it trough, otherwise I would not have my prints printed, I print them
trough a glass plate.
So, my logic is this: If I can get a print printed trough a glass, I can get my
eyes burned trough it as well.
Is this logic or just a sophism?
Also, I would prefer uv sources with a lot of visible light emission as Mercury
Vapor than those like BL bulbs.
In a strong "visible" light (is uv considered light?) my pupils will contract
allowing less light (and uv) going in but in a dimm light with strong uv
transmition my pupils will dilate allowing a lot more of uv in. That's why we
shouldn't wear sunglasses w/o uv protection lenses.
I'd like to hear more about uv and safety, how are the people out there working
with it.
Joao
BLAZE wrote:
> >I myself have always assumed that eyeglasses give the
> >protection stated for glass. But I do use a pair of supposedly UV-proof
> >goggles (bought from American Science & Surplus for $4) for extended
> >burning or dodging. It occurs to me in light of your story about false
> >claims to test them -- I thought of putting them on top of an emulsion and
> >exposing, to see the difference. Any comments?
>
> I did not follow this thread, so I don't know specific source of UV you
> are discussing, BUT I think anybody using UV light should be extremely
> careful. Let's not forget that some readers on this list may start using
> carbon arc burners without protection. If eyeglasses were sufficient to
> protect from UV light, welders would not have to wear welding masks and
> the rest of their halloween costumes. I used to work in a printing
> company where we had NuArc burners. Not only the light was dangerous, but
> the fumes were toxic. If you have the option of leaving the area when UV
> light is burning plates - do so.
> Ben
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