IR FAQ and pinholes (correction)

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

>To the group,
>
>I can see by the recent flurry of posts about the "pinhole" problem that
>there is a large, residual base of frustration out there.
>
>Once again, there are suggestions that reticulation from abrupt temperature
>changes or over-acidic shortstop might be to blame for the voids in the
>emulsion. (In this current exchange, no one mentioned dust.) These
>situations could damage your film, but the results would be gross - large
>damaged areas - and good darkroom technique will eliminate the problem.
>
>The pinholes I find in almost all my 4x5 HSI (even in the film sent to me by
>Kodak) are created in the emulsion coating process by minute particles in
>the anti-halation layer migrating into the image forming layer. This
>explanation was offered to me by Steve Hedges at Kodak in a conversation on
>8/10/98. I have since spoken with and written to Dick Johnson,  Kodak Dept
>MTS, about the problem. In November '98, I sent Johnson a packet of Email
>messages and posts from this group with complaints about pinholes. He
>eventually told me he hoped Kodak would solve the problem "by the end of the
>year" ('99).
>
>I am really upset that Kodak makes a defective productÖ but consider the
>alternatives. These Kodak guys are sympathetic and would like the production
>line to be changed. But, there is the dark suggestion that if it is too
>costly to fix, Kodak could drop the film. Is this just an intimidating
>bluff?
>
>In any case, I will compile a few recent posts into another letter to Dick
>Johnson and ask him how it is going.
>
>Stan Patz   NYC
>

>
>In my earlier post, I made a misstatement. HSI and HIE do not have
>anti-halation coatings. The pinholes, according to Steve Hedges, are due to
>migrating particles from an anti-static layer.
>
>My apologies for any confusion.
>
>Stan Patz  NYC
>
>


Hello Stan,

Have read with interest your previous posts about HSI and HIE pinholes.
Thanks for the update.

Please can I have your permission to include the contents of your postings
in the most recent version of the IR FAQ which I am rewriting?  I will of
course credit your contribution and provide a link back to you via EMail
and your web site if you have one.

Look forward to hearing from you,

Please copy your reply to irfaq@xxxxxxxxxxx, thank you.




All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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