Dupont film. Any information...

Hello there! I have a box of Dupont 4x5 film and I could not find anything about it. No tech sheet in the box, no info on the net.
If anyone has any information about it please share with me......

It's hard to say from the information provided. Cronar was the trade name for DuPont's polyester film base. They stopped making regular camera film in the 50s or early 60s, but continued with movie film into the late 60s of early 70s, and continued with process, industrial, and medical products until fairly recently. This is probably some sort of process film. The notch code, if it has one, would identify it. If it has no notch code, that would greatly narrow the range. I would think there would be an identifying code somewhere on the box. DuPont films generally had a name made up of three or four letters followed by a dash followed by one or two numbers. Sometimes there were only 3 letters. Examples are CPR-4, CLN-II, CLF, CGC-7, CHN, CRF-4, CBC-4, BLC-4, BLD-7, CCSF-7, and others. See if you can find something like that.

If you give me the product name I might be able to find it in my Photo-Lab Index.

Thanks for the help. Here are more pictures of the box and the film itself.

I also have an ortho film from Dupont. Luckily it has the tech sheet.

Minarik said:

Thanks for the help. Here are more pictures of the box and the film itself.

Click to expand...

ASA 400. I don't have any times, but I would expect if to develop about the same as Tri-X. Well, would have in 1965.

Try it in HC110 and see what happens.

Thanks Mark. At least we have an ISO. I was expecting lot less than 400. I loaded two doubbe film holders. I will take a field try tomorrow morning. I will share the results.
I don't have HC110. I guess Xtol would do the job as anything else.
According to Kodak, TX needs more time significantly, than TXP. I will start with Xtol 1+1 11 minutes @68F... I need crossing some fingers.

Good luck. I would try at lest a couple stops extra exposure and more development than the charts, maybe 25 percent, maybe more. I'm taking a wild guess, and perhaps someone else will have more suggestions. If you go over you'll know a lot more than if you go under. Should be lots of base fog, and probably a lot of unevenness. If there are sealed packs of film in there expect them to be much better than any sheets in an open pack.

I'm shooting Tri-X 35mm right now (just ran 2 rolls since my last post) that expired in 1990. I seem to be getting about EI 100 out of it with about 30 percent longer than chart time in HC110 B. Fog level is pretty reasonable. This film is from an unopened 100 foot roll that was stored in a non-air conditioned warehouse. I got a roll of TMY of the same age from the same locker and it fared considerably better, though I have no theory why.

HC110 is very good for keeping the fog under control with outdated film and might be worth picking up if your initial test looks at all promising.

Mark.
I shoot a lot with expired films. Lately I had Kodak Plus X from 1979 or Cronar Dupont Ks 19555 from 1971 and recently EFKE KB100. All were very good over all. EFKE still is the best. I will take your suggestion and i will buy HC110.
The films were sealed so my hope still alive. I will start with Xtol. I have 100 sheets to destroy.

Plus X: http://www.flickr.com/photos/8053628@N07/12627896175/
http://www.flickr.com/photos/8053628@N07/10920265436/

Efke: http://www.flickr.com/photos/8053628@N07/sets/72157633796343223/

Dupont KS-19555: http://www.flickr.com/photos/8053628@N07/10348056703/

Good. I hope I didn't sound pushy, but wanted to be sure you were aware of the issues. I know some people think it is crazy, but I enjoy messing with this old stuff. At least part of that is that it is virtually free, but I also find plenty to shoot that gives me good results. This does seem to correlate strongly with speed though, and sadly Tri-X is the film I've have had the least success with. And none of mine expired before the 80's. I hope you Dupont fares better. The sealed packs really do seem to help in my experience.

I've shot a lot of pretty old Plus-X aerial film and it has seemed to be as good as the day it was made. Probably the better storage this type product received, the good packaging, plus the slower speed. I shot at least a half dozen 9.5" x 125' rolls of that, and sold about 5 rolls of it here a while back.

BTW, I am just starting to use some old Dupont paper developers with excellent results. I'll check with my friend who had these to see if he has any more info on your film.

Mark Crabtree said:

ASA 400. I don't have any times, but I would expect if to develop about the same as Tri-X. Well, would have in 1965.

Try it in HC110 and see what happens.

Click to expand...

The data sheet hints at 1/3 less development time than Tri-X.

Any news? I'd love to hear that you got great results.

With my first set of sheets, I made a mistake. My day offs are comyng so ready for second set.

First sheet with some success.
I have two more to develop. I just exposed them today.

http://www.flickr.com/photos/8053628@N07/13050921815/in/pool-32733357@N00/

Great. Amazing to see it work. How foggy?