Rollei IR Antihalation removal

[9circles]

Hi all,
I have seen that the original Maco 820 IR 5x4 sheet film was available without the antihlation layer - 820 aura. I was wondering, assuming that the rollei IR film and the maco 820 are the similar, if it would be possible to wash the antihaltion layer off of the Rollei IR to give the aura effect . There would be obviously technical difficulties with dust, drying marks etc, but should it be possible?

Thanks for any replies

Ian

 

[Dave Miller]

The two films are very different, but, yes you could soak and wash the film prior to using it. There should not be any more problems with marks or dust than there are with normal development, except that you will be doing it in darkness.

 

[9circles]

Thanks for that Dave - so the rollei isn't just a case of a rebadge then? I'll get a box and give it a try with a couple of sheets to see how it turns out.

Best wishes

Ian

 

[Robert Hall]

This may be possible in theory, but perhaps not in practice.

One may very well wash off the sensitizing dyes that make the film what it is when washing off the halation layer.

If you are up for the experiment, let us know what happens.

 

[Dave Miller]

Thanks for that Dave - so the rollei isn't just a case of a rebadge then? I'll get a box and give it a try with a couple of sheets to see how it turns out.

Best wishes

Ian

I've not used the sheet film, only the 120 roll, so my experience is based on that. The emulsion, and film backing of the two products are very different, for example the backing doesn't curl so much and the emulsion is both faster, and physically harder on the Rollie.
As an after thought, have you considered that since the effect of the antihalation layer reduces with the larger film sizes, the effect of it's removal may not be noticeable on 5x4?

 

[Pete H]

When Maco 820 first came out (before Aura was available), I tried washing off the anti-halation layer (5x4 sheets). It worked fine. I haven't tried with Rollei.

 

[keffs]

A quote from the Rollei documents "pecial halation effects (AURA effect) by longer exposure times". Not sure what pecial means. I have not tried this, but it sounds as though it might be worth investigating.

Steve

 

[9circles]

Thanks for the replies. I read that overexposing would cause a aura effect and havent tried it as I can't get my head around the principle that overexposing with cause anything other than, well, overexposure. I may have to give it a try just to test it, but would have thought that no antihalation and standard exposure would give a more realistic aura. I love the effect on HIE and saw the similar effect on maco aura film.

Thanks all

Ian

 

[Dave Miller]

There is no such thing as a "standard exposure", and certainly not with IR films. Experimentation is the order of the day; enjoy the experience. and remember to tell us about it.