| Molecular Formula: C21H18O5S |
| Molecular Weight: 382.4 |
| Properties: greenish brown or brown powder; slightly soluble in water and ethanol. |
| Use: acid-base indicator. |
| PH range |
1.2(pink)-2.8(yellow); 7.4 brownish yellow-9.0(purple) |
| Ethanol solubility test |
Qualified |
| Drying loss |
1.0% |
| Maximum Absorption Wavelength, nm: |
| λ1(PH1.2) |
526-529 |
| λ2(PH2.8) |
431-437 |
| λ3(PH7.4) |
431-437 |
| λ4(PH9.0) |
576-580 |
| Mass absorption eoefficient, L/(cm,g): |
| a1(λ1, PH1.2, dry sample) |
80-94 |
| a2(λ2, PH2.8, dry sample) |
40-46 |
| a3(λ3, PH7.4, dry sample) |
39-45 |
