Re: [APML] what the heck is this?

[George Anderson <georgea@cam.org>]

Chris

The only problem I see with this explanation is the sharpness of the
points. Every time I buggered up loading a reel it was all smooth curves
and splotches. Not knowing how the emulsion layers are laid down during
manufacturing, my guess would be that the red layer did not bond
properly to the substrate and during the setting process in between the
red and the next layer part of the red emulsion was stripped off.
Visually it reminds me of stripping wallpaper when it hasn't been soaked
enough, maybe there is a jet of nitrogen used to evapourate the carrier.
But this is pure uneducated guessing as I don't know the process used to
build the emulsion layers.

George Anderson
Montreal Canada

Clear skies and good health

Chris Schur wrote:
> 
> Bobby, it reminds me of when film touches itself when processing, and
> prevents the chemistry from reaching the emulsion evenly.
> 
> Chris
> 
> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Bobby Middleton
> Sent: Wednesday, November 06, 2002 2:13 PM
> To: astro-photo@seds.org
> Subject: [APML] what the heck is this?
> 
> http://www.koyote.com/users/bobm/e200_problem.htm
> 
> Is this a processing problem or a manufacturing problem from Kodak? It
> ruined all my work from half a night last week. On parts of the slides you
> can see where no red recorded; almost like there was masking tape that kept
> the red nebulosity from recording but it still recorded matching background
> color and stars. On the rest you can see these big blue swaths where
> obviously only the blue layer was recording. Did my processor get me or did
> Kodak? Or is there any way my vacuum back camera did something? It was a
> pretty dry night with light+ but not moderate dew. This is 220 size E200 and
> I have another roll probably from the same batch. The batch # is 0263 031
> expire 07/2004.  I guess I don't use the other roll?
> Bobby Middleton
> 
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