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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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 Posted: Mon Nov 23, 2009 9:07 am Post subject: Pre-wash (Pre-soak) |
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Orio wrote:
when I did it, a lot of horrible looking black-blueish colour went off.
What is the purpose of that colour, and do 35mm film also have it?
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Carlsson
Joined: 26 Jul 2008
Posts: 793
Location: Portugal
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| Posted: Mon Nov 23, 2009 10:55 am Post subject: |
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Carlsson wrote:
It's part of the anti-halation layer. It is supposed to keep light from reflecting, reducing contrast.
And yes, 35mm films do also have it.
For some films the presoak is strongly recommended (for instance IR film).
I do presoak and change the water until it becomes clear.
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martinsmith99
Joined: 31 Aug 2008
Posts: 6950
Location: S Glos, UK
Expire: 2013-11-18
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| Posted: Tue Nov 24, 2009 6:59 am Post subject: |
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martinsmith99 wrote:
All 135 films?
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Katastrofo
Joined: 26 Feb 2007
Posts: 10405
Location: USA
Expire: 2013-11-19
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| Posted: Tue Nov 24, 2009 7:23 am Post subject: |
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Katastrofo wrote:
Efke/Adox film doesn't have the anti-halation layer. I need to learn how
to do stand developing with Rodinal before I shoot any of this film. The
one roll I shot I had the ma and pa place develop it, and the film is very
thin, think flimsy. |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Tue Nov 24, 2009 8:31 am Post subject: |
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Orio wrote:
I read you must use a hardening fixer with Efke.
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Carlsson
Joined: 26 Jul 2008
Posts: 793
Location: Portugal
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| Posted: Tue Nov 24, 2009 9:47 am Post subject: |
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Carlsson wrote:
| Katastrofo wrote: |
| Efke/Adox film doesn't have the anti-halation layer. |
Depends on the film, not the brand.
Some BW films with Anti-Halation Layer: Adox CMS20, Adox Ortho 25, Adox Pan 25, Rollei Pan, Rollei Ortho, Rollei IR, Rollei Retro 100, Agfa APX100, Formapan 100, Kodak T-Max 100
Fortunately some manufactures provide data sheets with information about AHU and pre-soak.
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Katastrofo
Joined: 26 Feb 2007
Posts: 10405
Location: USA
Expire: 2013-11-19
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| Posted: Tue Nov 24, 2009 10:33 am Post subject: |
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Katastrofo wrote:
I should have specified the Adox CHS and Efke KB films have only
single layer. Thanks. |
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