michael carboy
15-Jul-2001, 18:54
Hi Gang,
Wondering if anyone has a "chemistry" idea as to why I am getting some weird sta ining on the acetate side of 4x4 HP5 film. I am devloping in BTZS tubes, using both D76 1:1 and Rodinal 1:25. On the acetate side of the develoepd, fixed and washed film is "gloppy" patterns of milky streaking.. No amount of fresh fixer o r permawash will clear this mung from the film base. Heck, I have left the film in fixer overnight! by teh way, fixing is in Kodak Hardening Fixer...
The areas of discloration or most prevalent along the centerline of the sheet wh ere the midline is pressed tighest against the tube wall and no circulation arou nd the back of the film can occur. In the case of Kodak films, this effect alwa ys is taken care of in the fix and wahs process.... however, for HP5, the proble m will not "wash away".....nor will it "scrub off" when the film is wet...
Given the "durablity" of this milky staining, I am wondering if there is a chemi cal reaction occuring between the film base and devloper in the case of HP5 that simply is not occuring consistently, hence the mottled milky streaks...
Anyone else seen this problem? I can find no similar issues on photo.net..
Thanks, MEC
Wondering if anyone has a "chemistry" idea as to why I am getting some weird sta ining on the acetate side of 4x4 HP5 film. I am devloping in BTZS tubes, using both D76 1:1 and Rodinal 1:25. On the acetate side of the develoepd, fixed and washed film is "gloppy" patterns of milky streaking.. No amount of fresh fixer o r permawash will clear this mung from the film base. Heck, I have left the film in fixer overnight! by teh way, fixing is in Kodak Hardening Fixer...
The areas of discloration or most prevalent along the centerline of the sheet wh ere the midline is pressed tighest against the tube wall and no circulation arou nd the back of the film can occur. In the case of Kodak films, this effect alwa ys is taken care of in the fix and wahs process.... however, for HP5, the proble m will not "wash away".....nor will it "scrub off" when the film is wet...
Given the "durablity" of this milky staining, I am wondering if there is a chemi cal reaction occuring between the film base and devloper in the case of HP5 that simply is not occuring consistently, hence the mottled milky streaks...
Anyone else seen this problem? I can find no similar issues on photo.net..
Thanks, MEC