COLLOTYPES
Noun
collotypes
plural of collotype
Source: Wiktionary
COLLOTYPE
Col"lo*type, n. [Gr. glue + -type.]
Definition: A photomechanical print made directly from a hardened film of
gelatin or other colloid; also, the process of making such prints.
According to one method, the film is sensitized with potassium
dichromate and exposed to light under a reversed negative. After the
dichromate has been washed out, the film is soaked in glycerin and
water. As this treatment causes swelling in those parts of the film
which have been acted on by light, a plate results from which
impressions can be taken with prepared ink. The albertype, phototype,
and heliotype are collotypes.
Source: Webster’s Unabridged Dictionary 1913 Edition