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  Video tapes are made from an extremely thin ribbon of polyester that is then 
  coated with magnetic particles.  These particles carry the image and sound 
  information that allow the video to be viewed.  
  As they age, the polyester can weaken, making a stretch or break of the 
  tape more likely.  The magnetic particles that carry the image can lose 
  strength over the years - and much more quickly if place near any 
  source of magnetism.
  Another problem seen in some tapes is a whitish covering on the tapes (visible 
  through the plastic window).  This is considered to be mould and can 
  contaminate a VCR player.  Fot that reason we don’t accept such tapes - but 
  there are specialists around that will provide a cleaning service - at a cost.
  There appears to be no consistency in how these tapes have stood the 
  test of time with some lasting well and others not - even from the same 
  manufacturer and even when stored together.  In our experience, the 
  majority of tapes have managed to stand the test of time quite well - but 
  not all.  We have seen some tapes where some of the video is partially lost, and 
  others where the polyester tape itself has become so fragile that it was 
  impossible to repair. 
  No tape can be expected to last indefinitely.  To keep them at their best for the 
  longest period, they should always be stored in a cool (not cold) and dry place, 
  and away from dust.  An attic or garage is definitely not ideal!
  Cine Film problems with ageing
  Cine film is basically a reel of transparent plastic that is covered on one 
  side with gelatin emulsion.  Extremely small light-sensitive silver 
  halide crystals are embedded onto this emulsion and it these 
  crystals that form images when a cine camera lens focuses light 
  on the film as it runs through the camera. 
  Our experience indicates that the plastic film tends to be made of 
  stronger materials than video tapes.  However, considering the long 
  path that the film takes through any projector at the rate of 16/18 frames every 
  second, it does tend to suffer a little physically with every projection.  The film is 
  pulled forward with the projectors teeth in the films sprocket holes and paused 
  for one sixteenth of a second for the image to be projected before being moved 
  on again - quite an ordeal!  Physical problems that may be present with the film 
  would be evidence of scratching, burn out and wear/damage  to the sprocket 
  holes.
  However, the most common issue we see is that the colour of the emulsion in 
  some films has faded - and more rarely, the image itself has faded.   
  As ever, correct storage is as important to cine film as it it to video tapes.
 
  
  
  
 