Re: Reticulation ; Rodinal/Konica IR

[Joshua_Putnam <josh@xxxxxxxxxxxx>]

eml@xxxxxxxxx writes:

>> I've found Konica 750 *far* more sensitive to overly warm washes 
>> than any other film I regularly use -- for any other film I 
>> wouldn't worry about an 80F wash after 70F processing, but with 
>> Konica I try to limit my wash to no more than 5F over the 
>> processing temp.   
>>  
>This is a bit hard for me to believe.  I shot IR750 in the 120 size
>off and on for five or six years before moving to DC from Miami.  
>Even when my tapwater was 90F, I never had reticulation.  I DID,
>however, temper all solutions to exactly the tapwater temperature,

Obviously, if your processing temp is exactly the same as your
tap water temp, then your tap water temp isn't more than 5 F
above your processing temp -- that's sort of tautological, isn't
it?  

On the other hand, I have tap water that's a balmy 45 F
all year long, and I'm not going to chill all my processing
chemicals down that far.  Developers get *very* slow at those
temperatures, and fixing takes forever.

So to get a reasonable processing temperature I temper all the
chemicals to 68 or 70 F, then try to keep the wash no more than
5 F warmer than that, despite variations in the water pressure
on the hot and cold lines and the tank temperature of the water
heater as fresh, cold tap water mixes with the already heated
water.  No flushing the toilet while I'm washing film, please!
It is the *difference* in temperatures that causes reticulation,
after all, not the temperature per se.  Most films have no
trouble with an 80 F wash after 70 F processing, but Konica 750
seems more sensitive, thus the 5 F limit I try to maintain.

I may eventually invest in a thermostatic mixing valve to
automate the temperature control on the wash, but that's a
relatively expensive plumbing project.

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