Eric Neilsen (ejnasn@laplaza.org)
Sun, 31 Jan 1999 12:22:15 -0600
Joao,
Different glass allows different UV rays to pass through. It is
important to know which ones protect and which ones don't.
Joao Ribeiro wrote:
>
> 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
-- Eric J. Neilsen 7910 Treehouse Ln, Apt 1095 Dallas, TX 75231 214-378-8383 http://laplaza.org/~ejnasn
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