Melting point :330 °C (lit.)
Density :0.989
storage temp. :Store at RT.
solubility :Solubility Soluble in water, ethanol
form :Powder
pka :8.1(at 25℃)
color :Purple
PH Range :Red (7.1) to blue (9.1)
Odor :Phenolic odor
Water Solubility :Soluble in water.
λmax :610nm
Merck :14,1718
BRN :708596
Stability :Stable. Incompatible with strong oxidizing agents.
Major Application :Nanoparticles, cleaning microelectronic substrates, sensors, photographic materials, recording materials, water hardness measurement, indicator for calcium and magnesium, determination of vanadium, medical component, measuring magnesium in biological fluids, diagnosis of diseases caused by elemental imbalance, treatment of thrombocytopenia, Kurine analysis test strip
InChIKey :VBRNLOQCBCPPHL-VHEBQXMUSA-N
EPA Substance Registry System :1-Naphthalenesulfonic acid, 3-hydroxy-4-[(2-hydroxy-5-methylphenyl)azo]- (3147-14-6)

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
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P271 Use only outdoors or in a well-ventilated area. 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.