HIE and fogging

["Jaap Los" <imagefotografie@xxxxxx>]

Hi all,
When I gave a representation about IR photography last week, I got a
question from the audience on which I didn't know the exact answer. I said
that possible fogging of HIE during loading/unloading  in daylight could is
caused by:
1)  the lack of an antihalation layer whereby the film acts like a fibre
glass cable so that the light spirals from the beginning untill the very end
of the film within seconds.
2) the velvet slot in the cartridge allows IR light to pass.
Referring to sub 1) somebody in the audience wondered why  the lack of an
antihalation layer doesn't fog the film during normal exposure (once the
film has already been loaded in absolute darkness). In my opinion it was a
good question. During exposure the IR light gets a chance to enter the
polyester film base and why shouldn't it spiral up and down through the
whole film?  I said it doesn't because the exposure is very short. I am
however not sure this was the right answer. Can anybody enlighten me on this
matter?
Greetings,
Jaap Los
The Netherlands

See also my infrared photography homepage at:
http://home.wxs.nl/~losjb/hometest.html
with lots of infrared photographs, some of them lith-printed.

See alo my website
http://home.wxs.nl/~losjb/JBLhomepage.html
for those who are interested in company matters



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