Bleed is a term used to describe a picture with no borders, which has been printed to the edge of the paper. Blocking out is a 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. Blotter is a sheet or sheets of absorbent material made expressly for photographic prints. Wet prints dry flat and quickly when placed between blotters.
Blue print is an alternative term for cyanotype .
Blue sensitive is 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. Blur is unsharp image areas, created or caused by subject or camera movement, or by selective or inaccurate focusing. Boom is an adjustable metal arm, attached to a firm stand, on which lighting can be mounted. Some booms are also made to support cameras.