Melting point :210-212°
Boiling point :616.26°C (rough estimate)
Density :1.1342 (rough estimate)
refractive index :1.6300 (estimate)
storage temp. :2-8°C
solubility :Practically insoluble in water, soluble in methylene chloride, very slightly soluble in ethanol (96 per cent). It shows polymorphism (5.9).
pka :8.37; also reported as 8.51(at 25℃)
form :Solid
color :Yellow to Amber to Dark red
Water Solubility :10mg/L(temperature not stated)
Merck :14,2373
BCS Class :4/3

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H413 May cause long lasting harmful effects to aquatic life Hazardous to the aquatic environment, long-term hazard Category 4
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.