Re: Scotch tape = pin holes

[Colin McKie <colinmckie@xxxxxxxxxx>]

George L Smyth wrote:

> Actually, this is a problem with HSI, not HIE.
> 
> george
> 

George,

Stan noted earlier in the week:

"According to Kodak, HIE had a pinhole problem that was similar to HSI
(4x5), 
but had a different cause. Anyhow, Kodak says they fixed the problem.

The "manufactured" pinholes are very fine, almost microscopic, with 
irregular edges."

and later...

"In my discussions with Dick Johnson at Kodak, he talked about a problem
they 
had with HIE. Matte beads are placed in an overlying coating to keep
another 
piece of film from abrading the emulsion. At one point in the
manufacturing, 
these matte beads were migrating into the sensitized emulsion, causing
the 
voids we call pinholes. Kodak has now corrected the problem."

These are the little blighters that drive most of us mad! I don't use
HSI but all the HIE pinholes I've examined are consistent with the above
explanation.

Cheers,

Colin

http://www.geocities.com/main_mono
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