Recent content by Josaw98

I'll be waiting, best of luck!

Using sulfate instead of chloride ensures the solution is free of halides other than bromide. Although ferric chloride works excellently, I haven't noticed any visual difference between the two. I'm offering another alternative for those who want to formulate their own bleach, and let everyone...

Adding to this, I've found another economical way to obtain a working iron source for creating the complex. Ferric sulfate can be used; it's a slightly cleaner way to form ferric ammonium EDTA. However, where I live, the price of ferric sulfate is similar to that of ferric nitrate. Luckily for...

Hi, I can finally answer. I had problems logging into my account. I'm sharing my experience using this product. In my country, it's sold as a 13% iron chelating agent. Does it work? Yes, it does, but the processing times are very slow. For color negative film, you'll need processing times...

It's good that you mentioned it; that's another serious problem. It's very alkaline, but I don't see a buffer anywhere. The color depends heavily on the pH, and such a high pH will almost certainly result in a dominant color, a huge color shift. All the formulas I've seen are always between pH...

The amount of CD4 in your formula is too low for it to be ready in the 2-minute development time you suggest, assuming you develop at 38°C. I have a Kodak patent for a developer formula that promises to develop your film in 1 minute at 48°C and uses a much higher amount of CD4. Remember that...

I can get Na7 DTPMPA 500 ml for $150, is it worth it?

Excellent contribution, thank you very much. Yes, it's better to use another type of sequestrant. Etidronic acid is what I had on hand, but I ran out of the other sequestrants, though they're on their way. Regarding lithium salts, I have heard of them. The easiest for me to get is lithium...

I have been producing my own C41 chemistry for a couple of years now and after developing over 1000 films I can share with you a stable formula and some useful tips. The formulas are based on reading some Kodak and Fujifilm patents as well as my own empirical knowledge. You can see the result...

Josaw98 submitted a new resource: C41 Developer Working Solution and Replenisher - DIY Read more about this resource...

I'm about to get 1.3 PDTA and be able to do the bleach that you suggested here on the forum @Rudeofus

I am hoping that the ammonium chloride is exchanging with the sodium, but it is very likely that nothing is happening and that I am just using 2 halogenated agents instead of one. I don't know, but I do know that it is working.

Regarding DTPA, something different happened, I prepared a saturated solution of Sodium hydrogen ferric DTPA and added 13g of Ammonium Chloride and Ammonia until reaching a pH of 5.8, then added 80g of Ammonium Bromide. A deep red solution with yellow hues was formed and much denser than the...

The bleaching time was 6 minutes. I monitored it every 2 minutes and at minute 4 you could already see that the bleach was working correctly.

regarding this i did the following: i bought a bag of sodium ferric EDTA and also a bag of PDTA, parentheses here the bag of DTPA is Sodium hydrogen ferric DTPA but lets start with the EDTA. i prepared a saturated solution of sodium ferric EDTA (100-110gr/L) to this i added 15gr of ammonium...