Re: HIE Antihalation & intrest of Kodak to HIE users

[p geller <filje@xxxxxxxxxxx>]

George L Smyth wrote:

> > >  Subject: Halation
> > >
> > >  Has Kodak ever offered a reason for not putting an anti-halation
> > >  layer on HIE and EIR? And why IsEIR so expensive?
> >
> > Well that is a good question. I wonder if Kodak has an interest in their
> > consumer group. Many Kodak related questions have been raised and none has
> > been answered or led to a solution.
> 
> Perhaps because nobody asked Kodak! <g>  It is a good question, so I
> called Kodak and asked.  The reason that HIE and HSI do not have an
> anti-halation layer is that it impedes infrared.  With the layer the
> sensitivity would suffer.

> george

My guess was going to be that the lack of anti-halation dye in the
base works on the same principle as the shiny retinas of nocturnal
animals. It allows some photons that make it through the emulsion
to be bounced back into the film to expose more silver halide 
crystals.  

phil


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