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General photography questions and answers: Discuss mould on transparencies...Just come across some transparencies from the early 1970's. Unfortunately they have mould on them - anyone know of a ...
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Old 07-01-2014, 09:40   #1 (permalink)
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mould on transparencies

Just come across some transparencies from the early 1970's. Unfortunately they have mould on them - anyone know of a good safe way of removing it? I tried eclipse fluid and it does remove it bit I'm a bit concerned about the damage it might cause
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Old 07-01-2014, 09:56   #2 (permalink)
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Re: mould on transparencies

Is this on the emulsion side, the film side or both sides?
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Old 07-01-2014, 10:13   #3 (permalink)
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Re: mould on transparencies

Some on both sides but mainly on the back.Mostly they are just family photographs.
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Old 07-01-2014, 10:26   #4 (permalink)
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Re: mould on transparencies

When I lived in Malaya (in the 70s) this was a common problem.
I expect there are chemicals now that can do it, but we used to put the film in a plastic bag with bags of silica gel ( the small bags you get in new kit packaging) this dries and kills the mould.
Then on the non emulsion side use a lens cleaning fluid, carefully.
Then use a blower brush on the emulsion side. This is probably a "primitive" method these days but worked at the time. It is also a good idea to keep silica gel with the film to stop reccurance.
Hope this helps, Charles.
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Old 07-01-2014, 10:29   #5 (permalink)
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Re: mould on transparencies

Thanks Charles, how long did it take to be effective?
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Old 07-01-2014, 10:41   #6 (permalink)
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Re: mould on transparencies

About a fortnight out there , but it is very humid, to the extent that wardrobes had lamps biult in to stop the mold,( it could be visible after just two days!) so I would give it a week here and check. live mold smears, dead mold turns to "dust". Incidently I once had a tiny red mite in the pentaprism of a Pentax camera, and it used to wander round in the view finder, no effect on the image of course, but off putting, it lived there for 3 years and was still there when I replaced the camera.
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Old 07-01-2014, 10:45   #7 (permalink)
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Re: mould on transparencies

Blackadder's advice sounds good. I was going to suggest selecting the least valued slide and trying wetting it to reduce the grip of the fungus, maybe leaving it for a while to ensure it is completely dampened, then with care wiping the film side to remove the fungus and on the emulsion side using a cotton bud or sensor cleaning swab to remove it. When it is clean, a wash/spray with distilled water with one drop of washing up liquid and air dry it. Then keeping it/them with silica gel as suggested should keep the fungus away.
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Old 07-01-2014, 11:09   #8 (permalink)
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Re: mould on transparencies

Thanks guys I'll give it a try............on with the radiators to dry out some large silica gel bags I bought from the 7day shop a while ago
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Old 08-01-2014, 21:43   #9 (permalink)
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Re: mould on transparencies

I would try a soak in a very weak wetting agent at room temperature or less,if the water is to warm the emulsion just might slide off! if too cold you will end up with a reticulated slide which can be very pictorial, after a while try and give the tranny a shuffle while still in the soak, don't even try to wipe it off at this stage! and then somehow you have to let it dry off at room temp again don't be tempted to use a hair dryer, this is a very delicate operation! I'm afraid its going to be a hit or miss thing. As others have suggested there just maybe a chemical solution that can be used but I have not heard of one, you could even speak to a person at your main library to see how they clean their old trannys and negatives.......
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Old 08-01-2014, 22:49   #10 (permalink)
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Re: mould on transparencies

Thanks Des
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