Re: could it be bubbles?

[Dan Cardish <dcardish@xxxxxxxxxxxxx>]

At 02:26 AM 05-12-96 +0000, you wrote:
>On Wed, 04 Dec 1996 04:33:15 +0000 (GMT), Bob wrote:
>
>|>It sure sounds like bubbles (air bells) on the film during
>|
>|If there's a chemist on the list maybe he/she could confirm this, but I
>|believe that the Mylar (Polyester) base of Kodak's infrared film could =
>be
>|the cause of the air bubbles.  Most other films use an acetate film =
>base.
>
>I'm no chemist, but the emulsion covers the Mylar base on the side
>that gets processed, and therefore can be compromised during
>processing.  Bubbles on the Mylar side should not affect processing.
>
I think what was in the back of my mind when I made the post was the
possibility that perhaps Mylar can easily pick up a static electrical
charge, and that this is what causes the air bubbles to adhere (or more
correctly the air bubbles adhere to dust particles that are clinging to the
film).  Also, I notice the problem more in the winter when the air is dryer
than during the summer.  Again, any physical chemists reading this?

Dan C.


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Topic No. 34