-Boric acid - compound used in certain fixers to prolong shier hardening life.
-Bounce light - light that is directed away from the subject toward a reflective surface.
Sodium metaphosphate and boric acid are commonly used for this purpose. APERTURE-In an optical system, an opening through which light can pass. APERTURE, CURTAIN-The slit in a focal-plane shutter that permits light to reach the film.
Borates, such as borax (sodium tetraborate), boric acid and sodium metaborate, are toxic to plants, even at a concentration of 100 ppm. Many film developers and fixers contain 1 to 20 g/L of these compounds at working strength.
 See also: Film, Light, Color, Alkali, Grain
  
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