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Methylene blue
Methylene blue
(CI 52015) is a
heterocyclic
aromatic
chemical compound
with the
chemical formula
C
16
H
18
N
3
S
Cl
. It has many uses in
biology
and
chemistry
; for example, it can be used as a
stain
and as a
pharmaceutical drug
. At room temperature it appears as a solid, odorless, dark green powder, that yields a blue solution when dissolved in
water
. The hydrated form has 3 molecules of water per unit of methylene blue. Methylene blue should not be confused with
methyl blue
, another
histology
stain,
new methylene blue
, nor with the
methyl violets
often used as
pH indicators
.
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