Cresol Purple
Synonym(s):m-Cresolsulfonphthalein;m-Cresol purple;m-Cresolsulfonphthalein, 2′,2′′-Dimethylphenolsulfonphthalein, MCP
- CAS NO.：2303-01-7
- Empirical Formula: C21H18O5S
- Molecular Weight: 382.43
- MDL number: MFCD00005871
- EINECS: 218-960-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-07-14 15:27:00
What is Cresol Purple?
Chemical properties
green crystalline powder
The Uses of Cresol Purple
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.
The Uses of Cresol Purple
Acid-base indicator.
What are the applications of Application
m-Cresol Purple is a pH indicator dye
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).
Properties of Cresol Purple
| Melting point: | >250°C |
| Boiling point: | 577.5±50.0 °C(Predicted) |
| Density | 1.404±0.06 g/cm3(Predicted) |
| storage temp. | room temp |
| solubility | 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. |
| 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 |
| EPA Substance Registry System | Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl- (2303-01-7) |
Safety information for Cresol Purple
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Cresol Purple
Cresol Purple manufacturer
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