Blackened From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 5 months 3 weeks 1 day 3 hours ago) and read 6901 times:
I don't know if it's 100% true but it might be. Our skin has a pH of 5.5 and that's enough to damage a print. I've seen prints where you couldn't remove fingerprints anymore but with a little water it works there. I guess that's not possible with slides or negatives. But sometimes you can just take a piece of cloth and it more or less removes the fingerprint from a slide. Maybe it's not always so much acid but more fat and dirt.
Jan Mogren From Sweden, joined Dec 2000, 2043 posts, RR: 50
Reply 4, posted (13 years 5 months 3 weeks 1 day 3 hours ago) and read 6900 times:
It seems to be more difficult with old fingerprints.
On slides, I have sometimes thought that if I can't get this fingerprint off, I might as well throw this slide away.
In those cases I tried a crazy stunt and used Isopropanol on a cottonstick, and it worked!
***I have NO IDEA if the slide/neg will be destroyed with time because of this !!******
In the case I described it simply didn't matter to me.
The slide would have been a goner..
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Screener4 From , joined Dec 1969, posts, RR:
Reply 5, posted (13 years 5 months 3 weeks 1 day 2 hours ago) and read 6893 times:
I don't know if that's actually safe (alcohol), or if it will have a long-term damaging effect.
You should be able to wash your slides/negs under a running tap, and then with a CLEAN finger, gently brush away the fingerprint with your fingertip (while running your finger and the slide/negs under the tap the whole time). This will probably only work with NEW fingerprints, not ones that have been there for a while. (Don't forget, the negs/slides will have been washed with water in the lab, so it's quite safe - the only problem you might experience is drying marks - marks from where the water evaporates as the negs/slide dries out.)
Alternatively, you could try a lint-free tissue, as you would use to clean a camera lens. Only use this DRY, not wet.
Sonic99 From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 5 months 3 weeks 1 day 1 hour ago) and read 6889 times:
That was the emulsion Luis.
Fingerprints are not removable on either side of a slide. The oils and acids residing on fingers will embed in the emulsion (or opposite side) which is impossible to clean off (even trying to wipe off fingerprints with a lint-free cloth immediately after touching a slide).
At the lab where I get my slides developed all the personnel that handle slides wear white gloves so as not to leave their mark on the slides.
Rindt From Germany, joined May 2000, 930 posts, RR: 12
Reply 10, posted (13 years 5 months 3 weeks 18 hours ago) and read 6872 times:
Fingerprints are easy to remove from slides on either side... provided the fingerprint is "fresh". Simply stick the slide under luke-warm water, and rub away the mark. Make sure the slide is NOT in the frame... this could cause the glue to melt and damage the slide even further. With plastic mounts, the water never quite dries properly around the edges, so it's necessary that the slide be removed from its mount.
Once the mark has been removed, hang it to dry for about 20 minutes... I have done this a few times when slides have been accidentaly "soiled".
What other people think of you is none of your business!
Mirage From Portugal, joined May 1999, 3125 posts, RR: 14
Reply 20, posted (13 years 5 months 2 weeks 6 days 11 hours ago) and read 6817 times:
To be very sincere I don't check my profile to see that respected users list. I filled my profile a long time ago and that's it, and I didn't ask nobody to put me in their respected users list. I respect everybody and I disagree with everybody when necessary.