Definition of Congo red
1.
(Chem.)
An
artificial
red
dye
from
which
the
Congo
group
received
its
name
.
It
is
also
widely
used
either
in
aqueous
solution
or
as
test
paper
(
Congo
paper
)
for
the
detection
of
free
acid
,
which
turns
it
blue
.
Related Words
acid-base
indicator
,
azo
dye
,
solution
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