blue sensitive film
photographic film or emulsion which is sensitive to only the blue or ultraviolet portions of the spectrum.
blunging
a mechanical mixing of clay or slip with water.
-Blue sensitive - sensitive to blue light only. All silver halides used in traditional black and white emulsions are sensitive to blue light, but early photographic materials had only this sensitivity.
RED SENSITIVE EMULSION LAYER - PRODUCES CYAN DYES GREEN SENSITIVE EMULSION LAYER - PRODUCES MAGENTA DYES BLUE SENSITIVE EMULSION LAYER - PRODUCES YELLOW DYES Figure 2-8.-Cross section of color printing paper.
This method of scanning using red, green and blue sensitive sensors is where the term RGB color comes from. While it is not quite this simple, for practical purposes these sensors are in a line in the optical path of the scanner.
RAW data (which Nikon call NEF data) is the output from each of the original red, green and blue sensitive pixels of the image sensor, after being read out of the array by the array electronics and passing through an analog to digital converter.
The color layers in negative papers are actually produced to have speeds which increase from cyan (red sensitive) to magenta (green sensitive) to yellow (blue sensitive), and thus when filtered during printing, ...
With many older lenses you will get much sharper results with a yellow filter (many were designed when films were ortho or blue sensitive).
Orthochromatic ("correct colors") photographic emulsion is early black and white film emulsion, sensitive to wider range of colors than original color-blind (blue sensitive) emulsion.
The blue layer not only responds to blue light, but also to UV light, so if there is a lot of UV around the blue sensitive layer gets extra exposure and the final image takes on a blue color.
 See also: Green, Blue, Color, Light, Image
  
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