With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Containing
a
blend
of
silver
chloride
and
silver
bromide
salts
,
these
emulsions
produce
papers
sensitive
enough
to
be
used
for
enlarging
.
Containing:O
a:O
blend:O
of:O
silver:other-chemicalthing
chloride:other-chemicalthing
and:O
silver:other-chemicalthing
bromide:other-chemicalthing
salts:other-chemicalthing
,:O
these:O
emulsions:O
produce:O
papers:O
sensitive:O
enough:O
to:O
be:O
used:O
for:O
enlarging:O
.:O