Barium sulfate - compound used in the manufacture of photographic printing paper to give bright white highlights in the final print.
Barn doors - accessory used on spotlights and flood lamps to control the direction of light and width of the beam.
prints) is a term with no definite scientific meaning but is generally used to describe an item that will retain its original properties over a long period of time Baryta Baryta papers have a multi-layer coating that includes barium sulfate, ...
barytes
a colorless crystalline mineral of barium sulfate used as an ink pigment, extender, or filler.
 See also: Green, Filter, Film, Exposure, Image
  
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