Melting point :221-224 °C (dec.) (lit.)
Boiling point :539.4°C (rough estimate)
Density :1.1413 (rough estimate)
bulk density :350kg/m3
refractive index :1.5300 (estimate)
Flash point :36 °C
storage temp. :room temp
solubility :0.11g/l
form :Solid
pka :Pka1:1.65(at 25℃)(PH=1.2 to 2.8) Pka2:8.9(at 25℃)(PH=8.0 to 9.6)
color :Dark green to dark brown
PH Range :1.2(red)-2.8(yellow) 8(yellow)-9.6(blue)
Odor :Characteristic odour
PH :1.2-2.8
8.0-9.6 Water Solubility :Soluble in alcohol and dilute alkali solutions. Insoluble in water.
ε(extinction coefficient) :≥12000 at 298-302nm in 0.1 M NaOH at 0.01g/L
λmax :594nm, 376nm, 544nm, 430nm
Merck :14,9400
BRN :368036
Stability :Stable. Combustible. Dust may form an explosive mixture with air. Incompatible with strong oxidizing agents.
Major Application :Display device, semiconductors, sensors, fuel cells, antimisting coating for glass, toys, corrosion inhibitor, multi-level alert system, correction fluid, textiles, falsification-proof security paper, packaging system, measurement of hydrogen ion concentrationin swimming pool water, humidity-indicating agent, diapers, cosmetics, biostatic materials, determine bacteria growth, psychoactive drugs, antidepressant drugs, dental impression material
CAS DataBase Reference :76-61-9(CAS DataBase Reference)
NIST Chemistry Reference :Thymolsulfonephthalein(76-61-9)
EPA Substance Registry System :Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[5-methyl-2-(1-methylethyl)- (76-61-9)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
Precautionary statements:	P280 Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.