Re: (Fwd) Re: EOS: Light comming into A2E

[Wayde Allen <allen@xxxxxxxxxxxxxxxx>]

On Tue, 10 Jun 1997, Greg Pease wrote:

> the only experience i have with plastic is using a plastic reel to 
> process my first roll.  the sprocket hole area and part of the image area 
> of the film was (ever so slightly) fogged from where the plastic reel 
> touched the film.

Hmmmm...what is confusing to me, is that usually the film is loaded onto
the reel and placed in a light tight tank.  If light fogging were causing
this, why wouldn't the whole roll be affected?  I must be missing
something here.  The reel shouldn't be generating light inside the tank!

> however i just got a test roll back from the lab.  this roll 
> was also processed on a plastic reel and shows no such fogging.  hmmm.

It is this conflicting data that has been bothering me.  I would think we
should be able to solve some of these mysteries.  I do have a book on
plastics in my lab.  I'll try to look and see if there is any IR
transmission data for various plastics listed.  On a purely practical note
though, couldn't we create a list of equipment that has already been
tested by members of this list as being "safe"?  Perhaps a shorter (?)
list would be one of items known to be "unsafe".

- - Wayde
  (allen@xxxxxxxxxxxxxxxx) 


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