Archived posting to the Leica Users Group, 2001/05/31

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Subject: [Leica] RE: film tape glue flash
From: Jim Brick <>
Date: Thu, 31 May 2001 13:40:50 -0700

In order for the flash from the tape to in any way fog your film, you would
have to have film with a 10,000,000 ISO.

And it is "not" static electricity. It is atoms giving off light energy
(electron valence jump) when the glue molecules are ripped apart. This is
"electroluminescence" and is caused by the movement of electrons within a
substance from more energetic states to less energetic states, giving off
cold light as the energy medium. It is a minuscule amount.


At 03:23 PM 5/31/01 -0400, you wrote:
>I too have seen it and it is static electricity.  This is why I always keep
>a pair of scissors around to cut the tape rather then rip it.
>	-----Original Message-----
>	From:	Paul Chefurka 
>	Sent:	Thursday, May 31, 2001 2:24 PM
>	To:	''
>	Subject:	RE: [Leica] Mistake #1487
>	Yep.  It's static electricity, and it happens all the time when you
>tear tape off a plastic surface.  I've never seen it damage a film.
>	Paul
>	-----Original Message-----
>	From: []
>	Sent: Thursday, May 31, 2001 1:18 PM
>	To:
>	Subject: Re: [Leica] Mistake #1487
>	I've noticed something strange when I roll some films for
>developping .
>	When I tear the green sticker , attaching the end of film to the
>reel ,
>	it flashes a little bit , just like a short spark . 
>	Weird and scary for the emulsion !
>	Anyone noticed the same ?
>	will soon walk with mud covered combat boots...