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Base plus fog
The optical density of an unexposed area of processed film. This takes into consideration the density of both the base and the emulsion.
10 with a film base plus fog of 0.17 D.U. would give us an actual high density reading of 1.27 density units.
For black- and-white film, the minimum steps monitored are as follows: base plus fog (B + F) or gross fog, high density, low density, speed point, and contrast. For each step monitored on a control chart, there are three lines.
 See also: Back, Photograph, Reflection, Color, Prints
  
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