Recent content by yoso20

1.) Kodak Bleach III for C-41 RA process. This is a very concentrated and fast acting version (RA means rapid action) and was published in the patent US6649331: PDTA 113.6g 2,4-Dihydroxybenzophenon 0.95g Acetic Acid 80% 64.4 ml NH4Br 94.67 g Fe(NO3)3 * 9 H2O 136.93

Ah I see. For the first recipe, can you confirm this is the correct CAS#? PDTA - 1939-36-2 2,4-Dihydroxybenzophenone - 131-56-6

Hey Rudeofus, Do you know if we can make Fe Ammonium PDTA for the second recipe you shared if we have PDTA? If so, what compound is needed? Thanks!

I understand. Thing is, not sure what happened to Kodak but the availability of their bleach is very, very bad. I cannot simply risk running out of bleach and unable to run my business at all. There's one company that's making it however the cost is significantly more than Kodak's. We're using...

If we increase the PDTA content similar to Kodak or Konica's, do you think it will be safe for us to use in minilab machines?

Thanks for the reply! By the way, where do you usually source Fe PDTA? Is it the one from India?

Hi Rudeofus, Thanks for the reply! What is the usage for 2,4-Dihydroxybenzophenon? Is it safe to just skip this ingridient? Also, if you mention that we don’t need nitrate for modern plastic tanks, do we really need Fe(NO3)3 * 9H2O for the official Kodak bleach recipe then? Thanks!

Hey there! I saw a lot of posts from Ron (photo engineer) and other users about bleach recipe, but all of them are mostly ferricyanide based, or using the EDTA. I know the newest kodak flexicolor bleach III uses PDTA instead, does anyone have the figures for that by any chance? Thanks!