[Leica] Permanence and Care of Color Photographs: Henry Wilhelm.

[DABirkey@aol.com]

There is a rather large book that has gone through and tested all sorts of 
films using extended projection times. exposure to heat, fading due to 
Daylight etc.

I checked it out of a library a while back... 

The Permanence and Care of Color Photographs : Traditional and Digital Color 
Prints, Color Negatives, Slides, and Motion Pictures 
by Henry Wilhelm, Carol Brower 
  
This is the reference on the subject.  It covers everything... different 
types of paper, film etc..... show actual fade test comparisons

Many of the posting on the lug seem to be making a faulty assumption that the 
fading of Ektachrome and Anscochrome is due to projection and Kodachrome 
resists it better..... not so.... also remember that many of the early 
Ektachrome were processed in earlier chemistry.... different technology, 
different films.....   
there are many factors and projection is only one them.... humidity and 
temperature during storage are two biggies as well.

His conclusions are as follows...  Kodachrome is the best slide medium for 
long term dark storage..... but  it fades at a far faster rate than 
Fujichrome films as it is projected. 
 
A Fujichrome slide can be projected for a cumilative time of 2 1/2 hours 
without any loss for critical usage....  In can be projected about 5 hours 
before it noticeably begins to deteriorate....  I truthfully wasn't paying 
much attention to the Kodachrome figure since all I use is Fujichrome.... 1 
hr to 1 1/2 maybe total projection time if I remember right....  laying on a 
light table adds up to that counts too folks.........  

He either recommends shooting Fujichrome exclusively or using Kodachrome for 
long term storage but duping on to Fuji CDU for projection use....  
 
If you really want to find out..... take two identical slides.... stick one 
in a projector for an hour, look at it and see how much it has faded.  stick 
it back in for another 1/2 hour, check it again. do it until you've projected 
it for 4 or five hours. 

Do it for both Fujichrome and Kodakchrome or Ektachrome.  Keep good notes and 
compare the results.....  

But to argue that Kodachrome doesn't fade as fast E-6 films is not always 
right..... if you project your images, it will fade at a faster rate than 
Fuji.

Either way read the book..... don't wait for the movie....

Duane Birkey




it't title is something like care