Color Paper as Paper Negative?

[sanking]

I am curious to know if color paper can be exposed in the camera and developed in such a way as to produce a grayscale negative?

Sandy King

[keithwms]

There are (or were?) some ra4 papers for this, hyper seagull and ilford ilfospeed come to mind. IT's been a long while since i thought of doing this so I don't know what the status is of those. But I think they were designed for making b&w prints, with ra4 chems, using colour laser exposures.

[keithwms]

Ilfospeed rc digital...

I was very interested in purchasing some at some long ago but as I recall it could only be bought in large rolls.

[Domin]

While trying reversal RA I've noticed that supra and supra endura produce very low dmax when developed in rather contrasty b&w paper dev. The images were definitely low contrast so it might be a good starting point for some experiments.

There is also backprint issue. I've heard that there are/were some color papers without backprint but I don't remember ever seeing one.

[ZorkiKat]

The colour layers are also differently laid on colour paper- the red sensitive layer is on top. I don't know how this affects the colour of the picture, in case a positive is made. However, I have put 9X12 cm sheets of RA4 Konica Golden Dragon paper in an old plate camera before, as well as 60mm strips cut from paper long enough to make 5 or 6 exposures for 120 cameras. Processed in RA4, through a Durst RCP-20 processor. The paper negatives looked largely red- perhaps because of the native bias of the paper emulsion to halogen printing light sources?- but the complementaries of the other colours were there. Blue originals recorded as yellow, green foliage as pinkish red, etc.

This is the colour paper "negative", shot through a Rolleicord. The paper was taped on used backing paper and respooled:



The only way I can make positives from the colour paper negative shot with a 9X12 cm plate camera is by scanning it and reversing the colours digitally. It looked all blue:

[AgX]

Ilfospeed rc digital...

I was very interested in purchasing some at some long ago but as I recall it could only be bought in large rolls.

This paper is NOT a chromogenic paper and thus not intented for RA-4.

It is a panchromatic classic b&w paper.

[Photo Engineer]

Sandy;

Yes, you can expose color paper in a camera to get a paper negative. You can even get a good neutral out of it if you wish. You will need to experiment quite a bit to get the balance you want though.

It is Tungsten balanced with high UV and IR sensitivity so you will need a good UV filter. The Blue is about ISO 100, the Red is about ISO 25.

PE

[Peter de Groot]

This is very intresting. I have some outdated colorpaper. I will have a go with it. It will be possible to develop it in b+w developper? (I know everything is possible but will it give some decent results?) I'm gonna try it anyway. Seems interesting.

[keithwms]

ZorkiKat (and others), what happens if you shoot RA4 paper in the camera and then contact print that to RA4 paper? Curious.

[Nikola Dulgiarov]

Here's the best that I've done with Ra-4 paper( Kodak Endura)
85B filter, inspection developed in a tray at 30C
5X7