Acid Blue 93

Structural formula
General
Surname	Acid Blue 93
other names	Disodium 2 - {[4 - ({4 - [(2-sulfonatophenyl) amino] phenyl} - ({4 - [(2-sulfonatophenyl) imino] -1-cyclohexa-2,5-dien-1-ylidene}) ) methyl) phenyl] amino} benzenesulfonate ( IUPAC ) CI 42780 Methyl blue Cotton blue Aniline blue soluble in water
Molecular formula	C 37 H 27 N 3 Na 2 O 9 S 3
Brief description	odorless, dark blue-brown-purple powder
External identifiers / databases
CAS number 28983-56-4 EC number 249-352-9 ECHA InfoCard 100,044,852 PubChem 9875677 Wikidata Q422156
properties
Molar mass	799.81 g mol −1
Physical state	firmly
solubility	poor in water (70 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-315-319-335 P: 261-305 + 351 + 338
Toxicological data	> 5000 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

CI Acid Blue 93 (also methyl blue ) is an acid dye from the group of triphenylmethane dyes . Both the substance mixture of Acid Blue 93 with the very similar Acid Blue 22 ( water blue ) and these two pure substances themselves are often referred to as water-soluble aniline blue . It itself should not be confused with the similarly named methylene blue .

properties

Methyl blue has its absorption maximum in the wavelength range below 600 nm. The dye is soluble in water.

use

Methyl blue stains collagen in tissue structures blue. It is used as dye for the Polychrom - staining of histological sections, in the cytology and the pH - indicator used (pH 9.4 to 14.0).

Individual evidence

1. ↑ ^{a b c} Data sheet Acid Blue 93 (PDF) from Merck , accessed on February 13, 2010.
2. ↑ ^{a b c} data sheet Methyl Blue from Sigma-Aldrich , accessed on May 15, 2017 ( PDF ).
3. ↑ Aniline blue dyes .
4. ↑ Data sheet methyl blue, 10 g ( Memento from September 7, 2007 in the Internet Archive ) from Niepötter .
5. ↑ Coloring with methyl blue at Merck  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. .