5x7 green xray film

[Jay DeFehr]

Mammography film is one-sided, and so is duplicating film.

[DarkroomDan]

...In addition to this mention of the red sensitive film, I believe that I've heard that some other x-ray film is coated on one side only - its an option of sorts.

I seem to recall reading that mammography x-ray film is single sided. My only experience with x-ray films is with x-ray duplicating film. It is single sided but isn't actually intended to be exposed by x-ray.

Dan

[Jay DeFehr]

Dan,

How sensitive is the duplicating film?

[DarkroomDan]

Dan,

How sensitive is the duplicating film?

Jay, It is very slow. I don't have any speed index for the material I am using but, when I am enlarging 35mm negs to 8x10, I am getting exposure times of several minutes (5 to 8) with the enlarger lens wide open. I have been developing it in D-72 1:3. This gives me negs that I can use for carbon printing.

Dan

[Jay DeFehr]

Thanks, Dan. I assumed as much, but wanted to confirm. How is it working for enlarged negatives (aside from the long exposure times)?

[Dcohio]

Dan,
Thanks for posting this as I'm sure this will come in handy for images not suited for some printing processes.
Doug

[DarkroomDan]

Thanks, Dan. I assumed as much, but wanted to confirm. How is it working for enlarged negatives (aside from the long exposure times)?

I have only made about a dozen negative enlargements. There are enough controls available to adjust the contrast to work with various processes but I really prefer using my large format in-camera negatives.

In my previous post I didn't mention that I have taken to using the developer as single shot. I was having problems with working out exposures with test strips and then finding my full size sheet would not match my chosen test exposure.

Dan

[Jay DeFehr]

Hi Dan,

It seems to me exposure and development are (mostly) separate issues. Once you find the exposure that produces acceptable tone through the densest part of the negative, then you adjust contrast with development, right? Did you mean to write that once you worked out the contrast with test strips, you found your full size sheets didn't match your test strips?

I prefer using my in-camera negs, too!

[DarkroomDan]

Hi Dan,

Did you mean to write that once you worked out the contrast with test strips, you found your full size sheets didn't match your test strips?

Yep

Dan

[Dcohio]

Film came in today. Package says that it is made in Belgium and finished in USA. Not sure who coats films in Belgium. Tested a couple holders for light tightness with it and the film seems like it will work for some ideas I have. I tray processed in rodinal at 1-150 for 14 min. at an EI of 100. Just a quick still life using a 250 watt halogen and umbrella. The negs are drying but look ok for silver but way too thin for carbon. I will have to experiment and nail down and EI and times, but in that lighting I think an EI of 50 would be closer. Don't feel too bad experimenting with this stuff at $40 with shipping for 100 sheets. I didn't scratch the negs up that bad using trays and I was not gentle at all but I will be cutting some glass to put in my trays this weekend.
Doug