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According to Christina Z. Anderson and
Kosar:
7. Humidity: The presence of a certain amount of moisture in a coated
and
dried layer is necessary for the hardening reaction. When dry, the
moisture
remaining varies with relative humidity.
Completely dehydrated or fully
swollen coatings do not show any light
sensitivity at all, but in between
the sensitivity is high when the humidity
is high. Sensitivity doubles with
increase of 30% humidity.
In my experience, I have found the above to be true. My
question is, in the experience of the gum printers, what effect might
humidity have on contrast? Lower humidity equals higher contrast or
vice versa? All other things being as equal as they can be with
gum.
Candace Spearman
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