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Notes: Invented by Prof. Hamilton Smith
of Ohio in 1856, tintype photos were
photos with the image on a metal surface
rather than on glass or paper which had
evolved from the ambrotype whose images
were collodion negatives on glass, viewed
against a black surface. Tintypes, on the
other hand, were negatives on iron,
coated with black paint, lacquer or
enamel. The process was inexpensive,
and quality often poor and were popular
from the 1860s. It should be noted, too,
that most tintype or ferrotype images
appear reversed (left-to-right) from
reality. Although some cameras were
fitted with mirrors or a 45-degree prism
to reverse and correct the image, and
some photographers would photograph the
reversed ferrotype to produce a properly
oriented image, most images appear
reversed Tintypes were typically
superseded by gelatin emulsion dry plates
in the 1880s.
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