Does the Fomapan R100 also develop as a negative?

B8L · 2014-03-17T17:27:22+00:00

Hintergrund ist, dass es meines Wissens für Doppel 8 (Umkehr-) Filme nur zwei Labors gibt und man dann das Original auch selbst schneiden müsste. Nach einer...

B8L

The reason is that, as far as I know, there are only two laboratories that process Double 8 (reverse) film, and you would then have to edit the original yourself. Once the negative has been developed, a working copy could be made. I am not aware of any negative film with Double 8 perforations... Kind regards, € Hajo

Neutrino

It is generally believed that it is not possible to carry out a negative development, as the antihalation layer does not dissolve during normal negative development. € I can imagine, however, that there must be some trick to it. Perhaps someone else here knows more.

AchimBauer

Hi Hajo, I’ve no idea and no practical experience, but I’ve also thought about giving KB a go. In the US, quite a few people do this with KB film. I wanted to give it a go, but I can’t find any development times anywhere. However, there are recipes for removing the anti-halation layer on various film forums; you’ll have to do a bit of Googling. I’ll have a look to see if I’ve saved anything; if I find anything, I’ll let you know the sites where you can find it. € Regards, Achim

AchimBauer

Hi Hajo, I’ve had another rummage through my notes. I didn’t find much, but there is one thing: www.filmlabs.org/docs/schmalfilm_selbst_entwickeln.pdf or something like that – there’s a formula there for removing antihalation. Unfortunately, I can’t find any formulas using milder chemicals anymore. One point I noted down was that the ideal developer would be Rodinal 1:100 to control the contrasts, which would be very high in the negative. Whether that was based on experience or mere speculation, I don’t know, because that was the point where I abandoned the plan; finding a development time would have been manageable, but trying out several with different developers was too much for me, only to possibly realise that it wasn’t what I wanted, as there are plenty of beautiful films that don’t go beyond the 35mm format. You seem to have other reasons for the experiment, so I wish you the best of luck. Best regards, Achim

ThomasPauly

http://www.filmshooting.com/scripts/forum/viewtopic.php?f=1&t=20919&start=0 states: "Some black-and-white reversal films (Foma in particular springs to mind) use an opaque silver layer beneath the emulsion, which is bleached away during the reversal process." According to this, the emulsion consists of silver which is removed during the bleaching process, together with the image silver, from the initial development. ? To obtain a negative, one would therefore first have to use the bleach and stop bath from the Foma reversal process and then develop the film. This means carrying out the process without the initial development and reversal exposure. ? As a black and white transparency, the material is designed to achieve high maximum densities and is correspondingly rich in silver. For negative development, Silvermax is likely to be the ideal developer, as it was developed specifically for this purpose. Sensitivity utilisation and development times would need to be tested. ? According to the product description in the shop, the Bleach bath requires a certain degree of skill and quick work to use. The Foma developer kit is not cheap either. So, for what is likely to be an unspectacular result, one would have to go to a great deal of trouble. It is hardly likely to be worth it. ? [size=2]Regards[/size] ? [size=2]tepe[/size]