Opaque liquid is a dense red or black pigment, dissolved in water to form a liquid paint used to fill in film areas that are required to pint as pure white.
-Blocking out - method of painting selected areas of a negative with an opaque liquid on the non-emulsion side. Since light is unable to penetrate these areas they appear white on the final print.
 See also: Plate, Wavelength, Viewpoint, Alcohol, Opaque
  
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