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Photo Forum / Film Photography / Darkroom / May 2004Print stain from glass washing spray
Recently I've noticed a slight yellow stain on FB prints (untoned) mounted in frame under a glass. I know that the glass was washed with glass washer with ammonia. Could this cause a yellow stain on the paper? J. Lapinski "Jerzy Lapiñski" <apeka@poczta.onet.pl> wrote > Recently I've noticed a slight yellow stain on FB prints (untoned) mounted > in frame under a glass. Yellow staining is due to not enough washing. FB prints should be washed for 1.5 hours in running or frequently changed (every 5-10 minutes) water. Using a 'wash aid' reduces the washing time. In the US they go by the names 'Hypo Clearing Agent', 'Orbit Bath', 'Washing Aid'.... If you want to make your own a common formula is: Water 100-125 F 750 ml Sodium Sulfite 200 grams Sodium Bisulfite 50 grams Water to make l liter Use at 1:9 dilution. > I know that the glass was washed with glass washer > with ammonia. Could this cause a yellow stain on the paper? No. The ammonia is all gone in seconds after cleaning the glass. You can smell infinitesimal traces of ammonia - if it smells OK then there is no ammonia. -- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/ Well, the point is that prints that hasn't mounted coming from the same darkroom session does't not show any yellow staining. Even test prints, which were not fixed enought and were washed 30 sec. before drying in the microwave, do not show any stain. The print were made od Ilford FB MG paper, two bath fixer, and hypo clearing agent were used. The washing time was over an hour in relatively warm water - about 26 deg. C. On Sat, 29 May 2004 07:27:33 +0200, Jerzy £apiñski <apeka@poczta.onet.pl> wrote: >Well, the point is that prints that hasn't mounted coming from the same >darkroom session does't not show any yellow staining. Even test prints, >which were not fixed enought and were washed 30 sec. before drying in the >microwave, do not show any stain. The print were made od Ilford FB MG >paper, two bath fixer, and hypo clearing agent were used. The washing time >was over an hour in relatively warm water - about 26 deg. C. may3004 from Lloyd Erlick, If all those factors are constant, then I'd guess the mounting materials within the frame are the next best suspects. Adhesives and paper products... regards, --le Lloyd Erlick Portraits, Toronto voice: 416-686-0326 email: portrait@heylloyd.com net: www.heylloyd.com What type of frame, and how are you mounting the photos?  Signaturedarkroommike ---------- > Recently I've noticed a slight yellow stain on FB prints (untoned) mounted > in frame under a glass. I know that the glass was washed with glass washer > with ammonia. Could this cause a yellow stain on the paper? > J. Lapinski > What type of frame, and how are you mounting the photos? Alu frame, classical matboard with window, glass, it was mounted by by some kind of mounting specialist, I still do not know who it was, and I do not know what did they put beneath the photo. Most window cleaners are water, ammonia, and alcohol with a little blue color. If you are confident about your processing technique I would ask the shop that did the mounting about the materials they used. You can always clean the glass and then wait overnight before framing, giving the window cleaner 12 hours to evaporate. Signaturedarkroommike ---------- > > What type of frame, and how are you mounting the photos? > Alu frame, classical matboard with window, glass, it was mounted by by some > kind of mounting specialist, I still do not know who it was, and I do not > know what did they put beneath the photo. |
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