RetouchPRO

Go Back   RetouchPRO > Technique > Photo Retouching
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read


Photo Retouching "Improving" photos, post-production, correction, etc.

Small black specks on colour slide

Reply
 
Thread Tools
  #1  
Old 11-02-2010, 09:07 PM
Stephen_A Stephen_A is offline
Junior Member
 
Join Date: Aug 2009
Location: Hong Kong
Posts: 15
Small black specks on colour slide

Hi,
I just scanned some Kodachrome slides on a Nikon Coolscan. The slides are twenty years old. Before scanning, I cleaned the slides carefully by hand in water, using a tiny bit of detergent. A professional photographer recommended this. It usually works. Some of the slides still have small black specks on them. You can see them on this if you magnify it.

It's not a big deal, but I was wondering if anyone could confirm whether these are permanent damage to the surface of the film or merely the result of insufficient cleaning.

Thanks very much in advance for your comments.

http://www.mediafire.com/i/?vcd57raaqq5erq5
Reply With Quote top
  #2  
Old 11-02-2010, 09:22 PM
Flashtones Flashtones is offline
Senior Member
 
Join Date: Apr 2009
Posts: 956
Re: Small black specks on colour slide

that's a lot of specks. how dirty were these slides to begin with? what were the storage conditions? is it mold?
Reply With Quote top
  #3  
Old 11-02-2010, 09:32 PM
Stephen_A Stephen_A is offline
Junior Member
 
Join Date: Aug 2009
Location: Hong Kong
Posts: 15
Re: Small black specks on colour slide

Not especially visibly dirty - most of it was invisible to the naked eye. They were stored in normal plastic slide pocket sheets, but in ring files. Dust got in, and there might have been mould. Normal conditions here in Hong Kong where eight months of the year are pretty muggy and hot.
Reply With Quote top
  #4  
Old 11-02-2010, 10:25 PM
Flashtones Flashtones is offline
Senior Member
 
Join Date: Apr 2009
Posts: 956
Re: Small black specks on colour slide

I don't have a lot of experience scanning old slides so I can't be of much help, but that just doesn't look like dust to me (too regular in size and distribution). Certainly not if you've washed them. I wonder if it's a sort of reticulation from processing? Are all the rolls like this?
Reply With Quote top
  #5  
Old 11-02-2010, 10:31 PM
Stephen_A Stephen_A is offline
Junior Member
 
Join Date: Aug 2009
Location: Hong Kong
Posts: 15
Re: Small black specks on colour slide

The spots appear on some frames of all the rolls I've done. As far as I can recall, they were all done by the same processor.
Reply With Quote top
  #6  
Old 11-02-2010, 10:47 PM
mistermonday's Avatar
mistermonday mistermonday is offline
Moderator
Patron
 
Join Date: Dec 2005
Posts: 3,028
Re: Small black specks on colour slide

Stephen, Examine with a 10 x magnifying glass 1 slide that you have not washed and determine if those specs are actually there. If they are, trying cleaning the slide with 99% Isopropyl Alchohol (you can use 90% but no less). 99 is regularly available at all pharmacies. I would never recommend using setergent on the emulsion and if you use water it should be distilled.
The spots do not look like any moould I have ever seen on slides. Usually mould is found in clusters and not as very tiny dots with that type of distribution. The slides may have been exposed to some atmospheric chemical(s) that could have attacked the emulsion. See what happens when you clean one with the Iso.
If the Iso is successful removing the spots, you can get a small spray bottle with a fine mist and a microfiber cloth (sold by opticiens / optical dispensers / photography supply stores). Spray one squirt on the cloth and wipe to clean the slide.
Regards, Murray
Reply With Quote top
  #7  
Old 11-02-2010, 11:22 PM
Stephen_A Stephen_A is offline
Junior Member
 
Join Date: Aug 2009
Location: Hong Kong
Posts: 15
Re: Small black specks on colour slide

Thanks Murray and Flashtones for your replies. Murray, the spots are on the unwashed slides. Thanks for the info regarding the isopropyl alcohol and cloths. Carefully noted.

Stephen.
Reply With Quote top
  #8  
Old 11-02-2010, 11:29 PM
mistermonday's Avatar
mistermonday mistermonday is offline
Moderator
Patron
 
Join Date: Dec 2005
Posts: 3,028
Re: Small black specks on colour slide

Stephen, please let us know how it turns out.
Regards, Murray
Reply With Quote top
  #9  
Old 11-02-2010, 11:59 PM
Stephen_A Stephen_A is offline
Junior Member
 
Join Date: Aug 2009
Location: Hong Kong
Posts: 15
Re: Small black specks on colour slide

I will Murray. The only problem is a lack of 90-99% isopropyl alcohol in pharmacies in Hong Kong. 75% is the highest isopropy. The closest I can find is 95% ethyl. Will that do?
Reply With Quote top
  #10  
Old 11-03-2010, 07:18 AM
mistermonday's Avatar
mistermonday mistermonday is offline
Moderator
Patron
 
Join Date: Dec 2005
Posts: 3,028
Re: Small black specks on colour slide

Stephen, isopropyl is actually a denatured form of ethyl alcohol. You can use it BUT note that Ethyl alcohol is also used for consumption by humans in alcoholic drinks, So just make sure it does not have additives in it (like perfumes and flavors). I would assume if it is sold at a pharmacy it is probably ok.
Regards, Murray
Reply With Quote top
Reply

  RetouchPRO > Technique > Photo Retouching


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tutorial 05: Converting a Color Image to Black and White grayscale BW DannyRaphael Photo-Art 101 17 05-22-2011 05:55 PM
RP LIVE Black & White w/Gry Garness (rebroadcast) Doug Nelson RetouchPRO LIVE 17 03-09-2011 01:42 PM
set the black point/white and gray, help me? mantra Photo Retouching 1 10-16-2010 01:19 PM
Painting using the white colour swatch pls help sergio2263 Photo Retouching 3 02-21-2008 08:36 PM
Ignore Exif and Elements colour management Susan S. Hidden Power Support 18 08-26-2004 07:17 AM


All times are GMT -6. The time now is 09:18 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved