From: Benjamin.Kubelsky@verizon.net   
      
   On 12/6/2014 4:28 PM, John Levine wrote:   
   >>> Considering how the dyes in some old color prints (and for that   
   >>> matter, early Eastmancolor movies) have faded and shifted, maybe   
   >>> digital archiving isn't such a bad idea.   
   >>>   
   >> The trick played by some museums with colour prints was to make three   
   >> B+W copies, each with a different colour filter.   
   >   
   > The original Technicolor process used for the Wizard of Oz and Gone   
   > with the Wind used a camera that split the image and ran it through   
   > three filters to three B/W films.  That's why those movies still look   
   > great, while more recent ones shot in Eastmancolor don't.   
   >   
   >   
   >   
   Um, all early Technicolor was like that. The reason the Wizard of Oz and   
   Gone With the Wind look great is that, due to the popularity of the   
   films, they have been well preserved and painstakingly restored.   
      
   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.   
      
      
   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.   
      
   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.   
      
   Cheers,   
      
   David   
      
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