X Ray positives?

[Petzval Paul]

Hi everyone,

I'm trying my hand at making Resinotypes (nearly obscure prices similar to Oil printing, bromoils, etc) and I need to print from a positive. I currently use x ray film exclusively to make my 8x10 negatives and I've been trying to contact print them to create positives with little luck. I had been considering ordering up some Arista Ortho Lith film, which I useda bit back in the early 2000's. However, I've heard that there is something called x ray *duplicating* film which has spiked my curiosity. Does anyone have any experience with it? I'm wondering if it would work better for my purpose, or maybe to use in camera? It's that a crazy idea? Thanks in advance!

[pound]

you can do reversal processing on xray film to turn it into a positive.


you can mixed yr own chemicals or get the B&w reversal processing kit for foma, adox or rollei . You may have to test for optinum exposure although usually you have to overexposure by 1 stop to get a good density positive.

[Tin Can]

I have enlarged on Huge xray film from a negative making a Positive

Way easier

[Kiwi7475]

I have enlarged on Huge xray film from a negative making a Positive

Way easier

I’ve been meaning to try this, and was wondering how do you determine the required exposure to the X-ray film without having to try and iterate multiple times? Is there an incident EV or something like that that one could measure with an incident meter for a given exposure time?

[Tin Can]

I’ve been meaning to try this, and was wondering how do you determine the required exposure to the X-ray film without having to try and iterate multiple times? Is there an incident EV or something like that that one could measure with an incident meter for a given exposure time?

Test strips

I enlarged from 5x7 onto 4 sheets 14x17 edge to edge testing with 5~5x7 sheets at critical points

No meter needed and I have a high end Sekonic

[Kiwi7475]

Test strips

I enlarged from 5x7 onto 4 sheets 14x17 edge to edge testing with 5~5x7 sheets at critical points

No meter needed and I have a high end Sekonic

Right, I just wanted to get close enough to start with.

I guess I can guesstimate it from the fact that paper, say Ilford MG RC, is somewhere in the ISO 3-6, so if x-ray is ~80, I can try opening the aperture 3 stops and doing exposures on 1 sheet by covering small portions at a time (like you do for paper strips, lol), covering several 1/2 stop steps.

I don’t want to get into many seconds bc then reciprocity kicks in, and it’s awful for x-ray, so one has to find the right aperture/time combo that is both accurate and repeatable.

Once I get it this way I can just measure the EV with a meter and that way I know what I need to achieve for any enlargement size.

[Paul Cunningham]

There is indeed duplicating film that produces a positive when processed normally. I have a box of 8x10 dental duplicating film that I have only tested in the darkroom, but I can confirm that it creates positives directly without reversal processing.

[koraks]

I don’t want to get into many seconds bc then reciprocity kicks in, and it’s awful for x-ray, so one has to find the right aperture/time combo that is both accurate and repeatable.

.

You won't have to; exposures will be just a few seconds at a small aperture. Reciprocity is not going to be an issue. Just give it a try; expose say a 4x5" sheet in strips of consecutive stops (1 second, 2, 4, 8 etc), develop and evaluate.
The main challenge is not so much exposure itself but getting the right contrast for your printing process. So you'll have to work out the right ratio between exposure and development for a particular image. Its labour intensive but that's what alt process printing is for!

[Tin Can]

Please name it


There is indeed duplicating film that produces a positive when processed normally. I have a box of 8x10 dental duplicating film that I have only tested in the darkroom, but I can confirm that it creates positives directly without reversal processing.

[Paul Cunningham]

224721

[Tin Can]

Thank you

https://us.vwr.com/store/product/4537771/kodak-x-omat-ar-xar-autoradiography-film-carestream-health

[Andrew O'Neill]

I made positives with XRAY film for Gum Oil printing. Worked very well. I used single-sided Ektascan. Developed in LC-1B at a 1+5 dilution. After three years I stopped making Gum Oils, though. Wasn't fond with the look. I have also enlarged small format negatives onto XRAY, then contact printed for the negative to make carbon transfer prints...that was before I got into digital negatives.

[Tin Can]

I have made the choice to NOT use Digi negs

I made a few 25 years ago on a high end copier

I am almost full retro

[Kiwi7475]

Thank you

https://us.vwr.com/store/product/4537771/kodak-x-omat-ar-xar-autoradiography-film-carestream-health

It’s not cheap, over $200 for 50 8x10 sheets…

[Tin Can]

I did not suggest that film

I use this now, works great

Buy this not the slightly more X-Ray blue https://www.zzmedical.com/x-ray-accessories/x-ray-film/8x10-in-fuji-x-ray-film.html

Best deal going from the best supplier

I always buy a full case of 500 sheets, it ships better

I am sure I have bought and used $3K X-Ray from ZZ over 10 years

Always get fresh film from them


It’s not cheap, over $200 for 50 8x10 sheets…

[Kiwi7475]

I did not suggest that film

I use this now, works great

Buy this not the slightly more X-Ray blue https://www.zzmedical.com/x-ray-accessories/x-ray-film/8x10-in-fuji-x-ray-film.html

Best deal going from the best supplier

I always buy a full case of 500 sheets, it ships better

I am sure I have bought and used $3K X-Ray from ZZ over 10 years

Always get fresh film from them

Thanks, yes, I also shoot HRU… but for film positives the bluish cast from the film base is just not a very nice feature….

[Jim Noel]

The blue cast on the film will have no influence on the printing of any alt process.

[Paul Cunningham]

It’s not cheap, over $200 for 50 8x10 sheets…

I surely didn’t pay that. It was an eBay find.
Also it has a clear base.

Sent from my iPhone using Tapatalk

[Tin Can]

I just twigged my NOS 5X7 Industrial X-Ray may be untinted

I will waste a sheet later today

[Rick A]

I've done quite a bit of making positives using X-Ray film, it's a by product of enlarging negatives. The easiest way is to enlarge to make an inter positive (first step to making an enlarged negative)instead of contact printing. Best if you can use a lens with a shutter as the exposure times are very short even with the lens stopped all the way down.
Original negative was shot with a Mamiya 6, enlarged interpositive on 11x14 blue sensitive x-ray film, contact printed to make enlarged negative on same film, contact print from enlarged negative. I make enlarged positives for silk screen printing also.

[Tin Can]

This is 6X17 roll film enlarged onto 2X 14X36" X-Ray using Ilford PQ by hand see-saw in a smaller tray

No scratches, copied by old cell phone from a 16X48" viewer, bought 2 of those for $20

One shot, no PS, no waste

It was a gift to my Dr who worked in that building

She loved it, 2013 I think

https://live.staticflickr.com/65535/51887956665_71199664ec.jpg (https://www.flickr.com/gp/tincancollege/n98Sv4)X-RAY Clinic copy (https://www.flickr.com/gp/tincancollege/n98Sv4) by TIN CAN COLLEGE (https://www.flickr.com/photos/tincancollege/), on Flickr

[Kiwi7475]

This is 6X17 roll film enlarged onto 2X 14X36" X-Ray using Ilford PQ by hand see-saw in a smaller tray

No scratches, copied by old cell phone from a 16X48" viewer, bought 2 of those for $20

One shot, no PS, no waste

It was a gift to my Dr who worked in that building

She loved it, 2013 I think

https://live.staticflickr.com/65535/51887956665_71199664ec.jpg (https://www.flickr.com/gp/tincancollege/n98Sv4)X-RAY Clinic copy (https://www.flickr.com/gp/tincancollege/n98Sv4) by TIN CAN COLLEGE (https://www.flickr.com/photos/tincancollege/), on Flickr

That is pretty cool I gotta admit. If the Dr used X-ray for his/her work then it even adds more intangible value. What was the idea for display, frame it , or…?

[Tin Can]

I have made a number of X-Ray Positives for Doctors

Most have/had a Backlight viewer for X-Ray

If they did not have one, I fit the 'Art' filmpos to a $25 LED light panel, fits in a file drawer

I also tested X-Ray Pos in south facing windows for 2 years, those are boring by day but with backlight at night

They become!


That is pretty cool I gotta admit. If the Dr used X-ray for his/her work then it even adds more intangible value. What was the idea for display, frame it , or…?

[Rick A]

I was just watching this on Ilford reversal with film, I'll have to try it with X-Ray film.
https://www.youtube.com/watch?v=sbL9GmkvLtI