On Sunday, December 7, 2014 at 1:59:10 AM UTC-5, spsffan wrote:   
      
   > I don't know what you mean by Eastmancolor. Kodachrome as it was shot in    
   > the camera, was black and white film, with three layers of emulsion,    
   > each sensitive to a different color of light. The actual color dyes were    
   > added in processing. Properly cared for, Kodachrome from the 1940s still    
   > can be quite good. It does degrade with exposure to light.   
      
   While Kodachrome was originally developed as a movie film, I don't think it   
   was intended for commercial use because it creates a single transparency.    
   That is hard to accurately duplicate.  (Special films are required for   
   duplicaton or inter-negatives).     
   Movies were usually shot on negative film, which (until recently) were printed   
   which showed up as a positive image.  That was distributed.   
      
      
   > Ektachrome, which came later, had the dyes in the actual film. It tends    
   > to degrade even without exposure to light. But later formulas improved    
   > on this.   
      
   I believe the chemistry and characteristics of motion picture film differ from   
   that of slide film.   
      
   > Prints, as in 8x10s hanging on the wall are another story. Interesting    
   > thing is the 4 high school portraits of me and my siblings. All have    
   > hung in the same hallway for 30 plus years. My older sister, who went to    
   > a different high school who used a different photographer and obviously,    
   > different paper, is very faded. My brother, younger sister and me, all    
   > from a different school district, but only a couple of years newer, are    
   > just fine.   
      
   The paper may have had nothing to do with the fading.  Certain labs, for   
   whatever reason, didn't produce long lasting prints.   
      
   Long ago I learned to use Kodak processing despite the extra cost.  Slides and   
   prints by other labs are often faded, even if stored away.   
      
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