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Litmus paper
Meaning
Noun
●
In Chemistry, Lichens, Measuring instruments & Paper:
paper
containing
a
water-soluble
pH
indicator
composed
of a
mixture
of different
dyes
extracted
from certain
lichens
. The
resulting
piece of paper
is used to
test
materials
for
acidity
,
turning
red
when
acidic
and
blue
when alkaline.
Sourced from
Wiktionary
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