[pure-silver] Plastic developing tanks and IR film

--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

"The film may be getting fogged by exposure to
excessive heat... or by exposure to IR by being
developed in plastic tanks that are not opaque at near
IR.

IR film should be processed in stainless steel tanks 
to be sure."
---

Hummm,

Does anyone know for certain if Peterson's plastic
roll film developing tanks are IR safe?

I do know that, at least, one can NOT see through the
plastic wall with common IR devices, so I am guessing
it is at least opaque to about 950 nm but that is only
a guess.

Did they (Patterson) ever address this
problem/potential problem themselves? 

Ray


BTW
Anyone know which tanks are certainly NOT safe for IR
processing?



      
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