Need confirmation on accurate times for 16mm processing with D76.

[Taylor Page]

Trying to figure out accurate times for processing 16mm film with the regular reversal bath process using D76 as the 1st and 2nd developer. Current time has been 17 min for both, using 2000ml at 1 to 3 ratio in a Lomo tank. They come out pretty good, a little dense and grey, but watchable. Just wondering if there is any information on times for D76. Thank you much.

 

[Anon Ymous]

D76 is not the developer you need for this purpose and I doubt that you'll find any useful development times. D76 is a fine developer, when your output is a negative, much less so if you need a positive. For reversal processing, a much more energetic, high contrast developer would be needed, which also contains a silver solvent, like sodium thiosulfate, or potassium thiocyanate. Without a silver solvent, minimum density will be high, something you have already noticed. There are several options if you can scratch - mix your developers, some of whom can be found (there was a url link here which no longer exists). Another good thing about these high contrast developers is that development times are much shorter than the 17' you mentioned. Good luck!

PS This thread should be in the (there was a url link here which no longer exists) forum, reversal processing isn't considered an alternative process, like cyanotypes, salt print etc. Perhaps a moderator could move it.

 

[Taylor Page]

Sounds about right, knew D76 wasn't ideal for this situation, but it was cheap enough to use for experimenting. I also used potassium thiocyanate as the solvent, which is how I'm guessing the film actually came out as usable, but overall dense. Any top shelf developers you would recommend for this process? I'm debating on either D-19 or Kodak D-94 with the R 10 bleach, since I've been using permanganate as my bleach.

PS I can just delete this and repost under the correct thread if that helps? Thank you much.

 

[Anon Ymous]

Sounds about right, knew D76 wasn't ideal for this situation, but it was cheap enough to use for experimenting. I also used potassium thiocyanate as the solvent, which is how I'm guessing the film actually came out as usable, but overall dense. Any top shelf developers you would recommend for this process? I'm debating on either D-19 or Kodak D-94 with the R 10 bleach, since I've been using permanganate as my bleach.

D19 + thiocyanate is D67, a reasonable option for reversal processing 1st developer. But you also need to be more specific and say what film stock you use. Chances are that somebody will have used it and have first hand experience. BTW, thiocyanate levels can be tweaked to give cleaner highlights. Some experimentation might be needed.

PS I can just delete this and repost under the correct thread if that helps? Thank you much.

No, don't delete it. Instead of it, use the "Report this post" option at your original post to draw a moderator's attention and request to move the thread to the bw forum.

 

[Taylor Page]

The film stock I am using is Kodak Tri X reversal 7266 16mm. Hm ok, I didn't realize how important thoicyanate is in the process because I also processed one without it and it came out, but still a tad dense. And D19 + thiocyanate is really D76??? Exact chemical formula???

 

[Anon Ymous]

... And D19 + thiocyanate is really D76??? Exact chemical formula???

Eh, no, D19 + thiocyanate is D67, not D76.

 

[Taylor Page]

Ahh hah, my mistake then lol. I guess my question has been answered for the most part; don't bother with D76. And now that I said which stock I am using, are there any developers you would recommend to try? I can only think of D94, D19, and now D67

 

[Anon Ymous]

Ahh hah, my mistake then lol. I guess my question has been answered for the most part; don't bother with D76. And now that I said which stock I am using, are there any developers you would recommend to try? I can only think of D94, D19, and now D67

To be honest, I've never shot cine films, so can't really give any further directions. I've only used typical films for bw reversal. Kodak has a datasheet for Tri X reversal 7266, but the only developer mentioned there is D94A, assuming development in a film processor, at 24,4°C. This means a rapid processing scheme, with development needing only 1 minute. This is far too low to be practical for tank processing. You might get away with processing at 20°C, but you still need to somehow mix it. One of the ingredients, DTOD, which happens to be the silver solvent used in it, is hard to source and rather expensive. So, I'd say use D19/D67 and experiment with thiocyanate levels and development time.

Good luck!

 

[studiocarter]

I reversed 7266, which expired in 2002, with RO9. There are 4 videos about how it happened on my YouTube channel. Studiocarter1. It was very easy to use one liquid developer and not have to mix all the other things together.

 

[darkroommike]

D76 was used to process black and white negative movie stock and to my knowledge was never used for reversal processing.

 

[Gerald C Koch]

You would get better results if you followed Kodak's recommendations given below. Notice that the developers D-94A and D-95 are used for reversal not D-76. I believe that D-94A is the ascorbic acid version of D-94 and no longer recommended, use D-94 instead.

http://www.kodak.com/KodakGCG/uploa...Films/BW_Reversal/Technical_Data/H-1-7266.pdf

 

[georgegrosu]

In Processing KODAK Motion Picture Films, Module 15 - Processing Black-and-White Films
You can find more information about Kodak's reversible black and white process.
http://www.kodak.com/KodakGCG/uploa..._en_motion_support_processing_h2415_h2415.pdf pag. 15-24 at 15-29.

George