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Abrasion due to storage with other items causes
pieces of the emulsion (image) to flake off.
Humidity in the air then leads to
rust where the iron plate is exposed. As the tintype ages, more rust appears and
the flaking will continue, eventually destroying the picture.
The collodion surface of tintypes often shows fine
crazing or cracking, which distinguishes them from Ambrotypes. May show traces
of rust, the result of bends and deep scratche
Variation
on the Ambrotype process, but produced on iron sheet (not tin) instead of
glassPlate
coated with collodion and sensitized just before use;
Became
instantly popular, particularly in the United States; also widely used by street
photographers in Great Britain.
Cheap
to produce, a typical price for a tintype was 6d -1 shilling
More
robust than ambrotypes it could be carried about, sent in the post, or mounted
in an album.
The
material could easily be cut up and therefore fitted into lockets, brooches,
etc.
The
smallest were "Little Gem" tintypes, about the size of a postage-stamp, made
simultaneously on a single plate in a camera with 12 or 16 lenses.
Some tintypes are very
dark overall while other specimens have surprisingly good contrast with an
almost white background...
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