From: John W. Richardson (jrplatinum@earthlink.net)
Date: 06/29/00-09:59:28 AM Z
Cor:
The tubes with the blue filter are designated BLB. In the U.S. they are much more
expensive thatn the unfiltered BL tubes.
John Richardson
Cor Breukel wrote:
> "John W. Richardson" wrote:
> >
> > Rod:
> >
> > I am printing developing out platinum/palladium. I had been using 4' Sylvania
> > BL tubes.
>
> ..these names of these bulbs are rather confusing (and probably mean
> different things in different countries). Anyway "black light tubes"i n
> Holand mean these tubes they use (used..haven't been there
> lately..;-)..) in disco's, which make your teeth and white Tshirt light
> up. Anyway: these tubes have filters on it to block the more harmfull UV
> light, precisly the frequencies we need, so your printing times will be
> very long with these kind of tubes..
>
> Best
>
> cor
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