yet still allow water to flow out (fig. 10-1).
without damaging the sensitized materials being
processed. The color sensitivity of different sensitized
materials varies. Therefore, the color and intensity of
transmitted light must be varied accordingly. A
darkroom safelight is the combination of a rated light
safe from the effects of safelight illumination. However,
a filtered light is accepted as safe when the sensitized
materials can be handled under the illumination with no
evidence of fogging for at least twice as long as the
followed precisely when safelights are used:
between 3 and 6 feet.
of time the film will normally be processed.
coins. When there is less density, it indicates the film
was fogged by the safelight and the safelight is not safe.
A safelight that causes fogging may be corrected by
replacing the filter, by installing a lower rated bulb, or
Basic Photography Course