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Cresol Purple

Cresol Purple structure

CAS No.: 2303-01-7

Chemical Name:: Cresol Purple

Synonyms: Nsc 9607;BETZ 0420;CRESOL PURPLE;3-cresolpurple;m-Cresolpurpl;M-CRESOL PURPLE;M-cresol violet;METACRESOL PURPLE;pourpredem-cresol;Cresol Purple, M-

CBNumber:: CB7722734

Molecular Formula:: C21H18O5S

Molecular Weight:: 382.43

MDL Number:: MFCD00005871

MOL File:: 2303-01-7.mol

MSDS File:: SDS

TDS File:: TDS

Last updated:2026-04-24 14:58:30

Product description	Number	Pack Size	Price
m-Cresol Purple indicator grade, Dye content 90?%	857890	1G	$29.2
m-Cresol Purple indicator grade, Dye content 90?%	857890	5G	$74.5
m-Cresol Purple indicator grade, Dye content 90?%	857890	10G	$131
m-Cresol purple indicator	1.05228	5G	$285
Metacresol Purple	M0074	1g	$62
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Cresol Purple Properties

Melting point	>250°C
Boiling point	577.5±50.0 °C(Predicted)
Density	1.404±0.06 g/cm3(Predicted)
bulk density	480kg/m3
storage temp.	room temp
solubility	Very slightly soluble in water, ethanol; soluble in methanol
form	Liquid
pka	1.51, 8.32(at 25℃)
color	Dark green
PH Range	1.2 (red) - 2.8 (yellow) and 7.4 (yellow) - 9.0 (purple)
Water Solubility	Soluble in water and sodium hydroxide solution. Slightly soluble in alcohol.
ε(extinction coefficient)	≥ 11000 at 295-301nm at 0.01g/L (0.01 G/L in 0.005 N NAOH in Methanol) ≥26000 at 578-584nm at 0.01g/L (in 0.005 N NAOH in Methanol) ≥8000 at 369-375nm at 0.01g/L (in 0.005 N NAOH in Methanol)
λmax	579nm, 371nm
Merck	14,2577
BRN	350314
Stability	Stable. Incompatible with strong oxidizing agents.
Major Application	Fuel cells, sensors, display device, falsification-proof security paper, inks, correction fluid, paints, detection of electrophilic gases, lubricants, cement products, packaging system, adhesive, cosmetics, food storage, determining glucose in dialysis solution, screening of cat diseases, detecting carbohydrates, oral hygiene products
InChI	1S/C21H18O5S/c1-13-11-15(22)7-9-17(13)21(18-10-8-16(23)12-14(18)2)19-5-3-4-6-20(19)27(24,25)26-21/h3-12,22-23H,1-2H3
InChIKey	OLQIKGSZDTXODA-UHFFFAOYSA-N
SMILES	Cc1cc(O)ccc1\C(=C2/C=CC(=O)C=C2C)c3ccccc3S(O)(=O)=O
EWG's Food Scores	1
FDA UNII	85ODZ58K3D
EPA Substance Registry System	Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl- (2303-01-7)
UNSPSC Code	12171502
NACRES	NB.21

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS07

Signal word

Warning

Hazard statements

H302-H315-H319-H335

Precautionary statements

P261-P305+P351+P338

Safety Statements

24/25

WGK Germany

WGK 2 water endangering

TSCA

TSCA listed

HS Code

2934 99 90

Storage Class

11 - Combustible Solids

NFPA 704

	1
0		0

Cresol Purple price More Price(24)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	857890	m-Cresol Purple indicator grade, Dye content 90?%	2303-01-7	1G	$29.2	2026-04-30	Buy
Sigma-Aldrich	857890	m-Cresol Purple indicator grade, Dye content 90?%	2303-01-7	5G	$74.5	2026-04-30	Buy
Sigma-Aldrich	857890	m-Cresol Purple indicator grade, Dye content 90?%	2303-01-7	10G	$131	2026-04-30	Buy
Sigma-Aldrich	1.05228	m-Cresol purple indicator	2303-01-7	5G	$285	2026-04-30	Buy
TCI Chemical	M0074	Metacresol Purple	2303-01-7	1g	$62	2026-04-30	Buy

Product number	Packaging	Price	Buy
857890	1G	$29.2	Buy
857890	5G	$74.5	Buy
857890	10G	$131	Buy
1.05228	5G	$285	Buy
M0074	1g	$62	Buy

Cresol Purple Chemical Properties,Uses,Production

Chemical Properties

green crystalline powder

Uses

Acid-base indicator.

Uses

m-Cresol Purple acts as a pH indicator dye. It plays an important role in spectrophotometric pH measurements. It operates in the pH ranges 1.2 - 2.8 (red to yellow) and 7.4 - 9.0 (yellow to violet). Further, it is employed to stain epithelial cells and proteins.

Biochem/physiol Actions

m-Cresol purple is a pH indicator. It changes from red (pH 1.2) to yellow (2.8) and yellow (7.4) to purple (9.0).

Cresol Purple Preparation Products And Raw materials

Raw materials

Preparation Products

Cresol Purple Suppliers

Global( 287)Suppliers

Supplier	Tel	Email	Country	ProdList	Advantage
Hebei Chuanghai Biotechnology Co,.LTD	+86-86-13131129325 +8613131129325	sales1@chuanghaibio.com	China	5235	58
Watson Biotechnology Co.,Ltd	+86-18186686046 +86-18186686046;	sales01@watsonbiotech.cn	China	5735	58
career henan chemical co	+86-0371-86658258 +8613203830695	sales@coreychem.com	China	29819	58
Shenyang Simchoice Chemical Co.,Ltd	+86-024-23769576 +86-15040101888	sales@simchoicechem.com	China	254	58
Antai Fine Chemical Technology Co.,Limited	18503026267	info@antaichem.com	CHINA	9636	58
Hefei TNJ Chemical Industry Co.,Ltd.	+86-0551-65418671 +8618949823763	sales@tnjchem.com	China	34563	58
ANHUI WITOP BIOTECH CO., LTD	+8615255079626	eric@witopchemical.com	China	23541	58
Dideu Industries Group Limited	+86-29-89586680 +86-15129568250	1026@dideu.com	China	18895	58
AFINE CHEMICALS LIMITED	+86-0571-85134551	sales@afinechem.com	China	15082	58
Wuhan Fortuna Chemical Co., Ltd	+86-27-59207850	info@fortunachem.com	China	5974	58

Supplier	Advantage
Hebei Chuanghai Biotechnology Co,.LTD	58
Watson Biotechnology Co.,Ltd	58
career henan chemical co	58
Shenyang Simchoice Chemical Co.,Ltd	58
Antai Fine Chemical Technology Co.,Limited	58
Hefei TNJ Chemical Industry Co.,Ltd.	58
ANHUI WITOP BIOTECH CO., LTD	58
Dideu Industries Group Limited	58
AFINE CHEMICALS LIMITED	58
Wuhan Fortuna Chemical Co., Ltd	58

View Lastest Price from Cresol Purple manufacturers

Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
2026-04-30	Cresol Purple 2303-01-7	US $0.00-0.00 / kg	1kg	99%	20MT	Watson Biotechnology Co.,Ltd
2026-04-30	Cresol Purple 2303-01-7	US $0.00 / KG	1KG	98%min	30tons/month	WUHAN FORTUNA CHEMICAL CO., LTD
2025-05-26	m-Cresol Purple 2303-01-7	US $5.00-2.00 / KG	1KG	99%	1000kg	Hebei Chuanghai Biotechnology Co,.LTD

Cresol Purple
2303-01-7
US $0.00-0.00 / kg
99%
Watson Biotechnology Co.,Ltd

Cresol Purple
2303-01-7
US $0.00 / KG
98%min
WUHAN FORTUNA CHEMICAL CO., LTD

m-Cresol Purple
2303-01-7
US $5.00-2.00 / KG
99%
Hebei Chuanghai Biotechnology Co,.LTD

Cresol Purple Spectrum

Cresol Purple(2303-01-7)MS Cresol Purple(2303-01-7)¹HNMR Cresol Purple(2303-01-7)IR1 Cresol Purple(2303-01-7)IR2

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M-CRESOL PURPLE, INDICATOR GRADE M-CRESOL PURPLE FREE ACID M-CRESOL PURPLE INDICATOR Phenol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis3-methyl- M-CRESOLSULFONPHTHALEIN M-CRESOLSULFONEPHTHALEIN M-CRESOL PURPLE METACRESOL PURPLE CRESOL PURPLE BETZ 0420 3-cresolpurple m-Cresol Purple sodium salt, 0.04% w/v aq. soln. Cresol Purple, M- m-CRESOL PURPLE (pH indicator) AR M-CRESOL PURPLE, INDICATOR GRADE, PURE 3,3-Bis(4-hydroxy-2-methylphenyl)-3H-2,1-benzoxathiole 1,1-dioxide m-Cresol Purple,pure,indicator grade Cresol purple solution 0.04 % pH M-Cresol Purple, indicator grade, pure 5GR M-CRESOL PURPLE INDICATOR 5 G M-cresol, 4,4′-(3h-2,1-benzoxathiol-3-ylidene)di-, S,s-dioxide O-toluenesulfonic Acid,α-hydroxy-α,α-bis(4-hydroxy-o-tolyl)-, Γ-sultone Nsc 9607 4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis(3-methylphenol)s,s-dioxide 4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis(m-cresol)s,s-dioxide cresolpurple(non-specificname) Phenol,4,4’-(3H-2,1-benzoxathiol-3-ylidene)bis(3-methyl-,S,S-dioxide phenol,4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis[3-methyl-,s,s-dioxide pourpredem-cresol 3,3-Bis(4-hydroxy-2-Methylphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide Cresol Purple USP/EP/BP M-Cresol purple, indicator m-Cresol purple, indicator m-Cresol purple pH indicator solution M-cresol purple indicator solution m-Cresol purple indicator 1GM m-Cresol purple indicator 5GM m-Cresol Purple extrapure AR m-Cresolpurpl M-cresol violet m-Cresol purple, pH indicator dye Meta-CRESOL PURPLE INDICATOR m-Cresol Purple m-Cresol Purple (Technical Grade) m-Cresol purple: 3,3-bis(2-hydroxy-4-methylphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide 2303-01-7 2303-01-07 2303-10-7 Indicator (pH) pH Indicators Sulfonephthalein Analytical Chemistry Indicator (pH) pH Indicators Organics