Recent content by renevich

I can report that Mr. Kuvempunagar's recipe for Ferric Oxalate works perfectly for Pt/Pt printing. Compared to my years old, carefully stored powdered ferric oxalate from B&S, it fares better: better D-Max and graduation, judging only by my eye. I used it about an hour after prepared, WITHOUT...

I do use current and less expired film too, but your suggestion may lead me to optional alternative separate batches for expired emulsions. In any case it is indeed another route to explore. Thanks again.

Thank you. I do use the real chemistry from tetenal and the results are dissapointing with very expired ektachrome. No surprise indeed, since it is very expired. Just want to give it a try. I'll look up the Hydroquinone Mono Sulfonate Potassium salt for starters. I guess Antec chemicals would be...

Thanks Mr. Mowrey. What would you suggest instead as a FD, and here I quote Grant Haist's introduction to the formula I'm interested in, for being "claimed to provide substantially the same color image from fresh or aged color materials"? I'm aiming at getting better results from very expired...

Well the formula calls for 2 gr of quadrafos so I guess you're implying that I should substitute it with 2 gr of sodium hexametaphosphate, correct? The formula does use phenidone (1-Phenyl-3-pyrazolidone) and hydroquinone.

WOuld you say that the substitution would be weight by weight? Or should I consider a factor in the substitution?

9.25 @ 27 C is what is called for.

Thanks for your quick response and informative reply. I intend to use it in an alternative FD for E6 that Grant Haist mentions in his book MODERN PHOTOGRAPHIC PROCESSING (Vol 2 pg 537). The target PH he mentions is 9,25.

I'm looking for a substitute for Quadrafos CAS 14986-84-6 since this chemical seems almost imposible to source out. Any wisdom sharing on this will be very much appreciated