Burkhardt Kiegeland (bkiegeland@lotusintergate.at)
Thu, 20 May 1999 07:41:24 +0200
Gary,
I used to have this kind of scratches sometimes on my
Bergger BPF200 when
rotation developing in different drums (3005 drum
designed for 5 sheets of
8x10" as well as 3062). The scratches didnīt show up
when tray developing.
I couldnīt explain the phenomenon at first but finally
found that scratches
were caused by very tiny hard lime particles in the tab
water which were
sticking in the tubes of dry drum. Pushing the film into
the 5 tubes caused
the fine sratches.
In the bigger (paper) drums the sheets can be shuffled
around during rotation
which caused scratches on my 11x14" negs until I made a
special mat for fixing
them. This is described in one of the recent Jobo Newsletters.
As I canīt make our water different - which has a very
high content of lime in
it - I now do another cleaning of the drumīs tubes
before I load them.
Scratches disappeared.
When you donīt succeed with this I would ask you to ship
a scratched sample
including the opened box so that we can do some research.
Our US rep John Horowy of Rockford will be happy to help you.
Best regards
Burkhardt Kiegeland
Lotus View Camera
http//www.lotusviewcamera.at
Gary Miller wrote:
> I am looking for knowledge from our collective list regarding scratches on
> 8x10 film. I know that we have had this come up before, but I would like to
> know if anyone else is seeing scratches in the same or similar situation
> that I am and if they have any suggested remedies. I am processing Bergger
> 200 8x10 film in a Jobo 3050 Expert drum on a Beseler motorbase unit using
> Rollo pyro at 70F. I am using the protocol from TNPP with some slight
> modifications. For instance, I am doing two initial Na metaborate presoaks
> for 3 mins each before the developing process. Once the film is developed I
> am washing it in an archival washer for 20 minutes. I am seeing scratches,
> most of them running along the horizontal (longer spanned) of the film, on
> some of the film, maybe 2 or 3 sheets out of the five that fit in the
> processing tank at one time. I am wearing latex gloves when I load the film
> into the holders, when I take the film out of the holders and load it into
> the Expert tank, and then when I take the film and place it into the
> archival washer and then when I take it out of the washer. I am very
> careful not to handle the film roughly at any point in the process. The
> water supply that I am using is double filtered tap water. I am thinking
> about switching to a distilled water supply because this was mentioned by
> some as the culprit in tray developing. I am also not sure if one or two of
> my holders may somehow be scratching the film upon loading or unloading. I
> do not want to change too many variables at one time or invest in a couple
> of new 8x10 holders if they are not needed. The odd thing is that I am
> using the same procedure as I did with my first box of Bergger film in which
> I incurred no scratches. The scratches have just appeared now that I have
> started using a new box of film. I have also noticed more pinholes with the
> second box of film. Any ideas would be greatly appreciated. Thanks
>
> Gary Miller
This archive was generated by hypermail 2.0b3 on Thu Oct 28 1999 - 21:39:34