How Safe Is Your Safelight A GUIDE TO DARKROOM ILLUMINATION

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Content
Publication K-4 ?October, 2006
How Safe Is Your Safelight?
A GUIDE TO DARKROOM ILLUMINATION
IMPORTANT FACTS ABOUT SAFELIGHTS
> No safelight provides completely safe exposure for
an indefinite period of time.
> Safelight filters are designed for specific types of
paper and film.
> Safelight filters fade with use.
> Poor safelight conditions can produce a loss in
photographic quality before actual fogging is visible.
> Many photographic materials require handling in
TOTAL darkness.
Therefore, you should
?Follow all safelight recommendations for your paper or film.
See product instructions for recommended safelight filter,
bulb wattage, and minimum safelight distance.
?Test your safelight conditions regularly.
?Replace your safelight filters when necessary.
In photography, the term “safelight” describes darkroom
illumination that does not cause a visible change to lightsensitive
material when it is correctly handled and processed.
The word “safe” is relative. Most sensitized materials will be
affected if you expose them to safelight illumination for an
extended period of time. Because photographic materials vary in
speed and sensitivity to different colors of light, the
recommended bulb wattages and colors of safelight filters also
vary. Safelight illumination will fog color films and papers; color
print…