Yes, we have a computer program at Kodak to calculate Enthalpy of mixing for making emulsions. Temperatures must be very precise at all times.
PE
PE
I suppose that one other answer if you want to avoid working out the total effect on average temp over say a 12 minute dev time would be to then cool the mixture until stable before using it
I have had some problems with spots of inadequate development with roll film. I use Pyrocat-HD. Pre rinse has largely eliminated them. Our water is fairly low in dissolved materials. To be on the safe side, I'm considering a drop of wetting agent in the developer (or maybe the pre rinse). These are available locally. Has anybody got particular recommendations for this purpose (in particular avoiding foaming)?
Ilford Ilfotol
FOTOSPEED FS RA50 rinse aid
AGFA MA APH59 Agepon (Compard)
KODAK K Photoflo 200
I believe that recommendation was with respect to C41 film.PE recommends never ever ever ever ever ever putting wetting agent in the developer. Just ask him.
PE recommends never ever ever ever ever ever putting wetting agent in the developer. Just ask him.
I believe that recommendation was with respect to C41 film.
ok,ok I believe you! Or how about wetting agent in pre wash?Alright, here it is for B&W. NEVER EVER EVER put a wetting agent into a developer of ANY sort for ANY film!
PE
Thanks for making things clear PE. REALLY, REALLY, REALLY clear.Alright, here it is for B&W. NEVER EVER EVER put a wetting agent into a developer of ANY sort for ANY film!
PE
I could try isopropylalcohol in a pre wash. Is the 5% mentioned in a previous post a good quantity to use?
What might a tiny amount of wetting agent do that is likely to result in problems and what might those problems be? I am simply looking for info. I have never had the OP problem and have no axe to grind.Alright, here it is for B&W. NEVER EVER EVER put a wetting agent into a developer of ANY sort for ANY film!
PE
What might a tiny amount of wetting agent do that is likely to result in problems and what might those problems be? I am simply looking for info. I have never had the OP problem and have no axe to grind.
Thanks
pentaxuser
ok,ok I believe you! Or how about wetting agent in pre wash?
I could try isopropylalcohol in a pre wash. Is the 5% mentioned in a previous post a good quantity to use?
Foaming, which may cause development issues as seen in post #38.
But I had used LFN for over two decades without a single problem. It was only with the new bottle of LFN that the problem happened, so you can only draw the conclusion that LFN now might cause problems, not that all wetting agents cause problems. The old LFN never caused problems. In fact it solved problems. No air bells.
Interesting. It seems that different wetting agents have different characteristics, hence my question about which to choose a few posts above. Or maybe some are more powerful in effect and might be ok if less were used.
and IPA might extract needed chemicals from the film.
Which beer are you adding? Interested reader want to know!
View attachment 231421
IPA = isopropyl alcohol
Now that IPA is just not good to drink! Why did you not say CH3CHOHCH3 instead?
Glad it worked. I regularly mix water with alcohol. The best alcohol and water mixture I have found is from Speyside in ScotlandOn a slightly more serious note, this is a new one on me.
It doesn't sound as if there were any other extraneous factors to have caused this so can we assume that it was simply the IPA and water and can anyone explain how this arises? 2C is quite a jump
Thanks
pentaxuser
Probably it would not, I really don't know, but why take a chance. Many of the chemicals we add before coating are dissolved in IPA.
PE
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