Molecular Structure:

Molecular Formula: C₂₈H₃₁ClN₂O₃
Molecular Weight: 479.0103 
IUPAC: [9-(2-Carboxyphenyl)-6-(diethylamino)xanthen-3-ylidene]-diethylazanium chloride
Synonyms of Rhodamine B (CAS NO.81-88-9): 9-(2-Carboxyphenyl)-3,6-bis(diethylamino)xanthylium chloride ; Ammonium, (9-(o-carboxyphenyl)-6-(diethylamino)-3H-xanthen-3-ylidene)diethyl-, chloride ; C.I. Basic Violet 10 ; Ethanaminium, N-(9-(2-carboxyphenyl)-6-(diethylamino)-3H-xanthen-3-ylidene)-N-ethyl-, chloride (9CI) ; Xanthylium, 9-(2-carboxyphenyl)-3,6-bis(diethylamino)-, chloride ; Xanthylium, 9-(2-carboxyphenyl)-3,6-bis(diethylamino)-, chloride (1:1) ; C.I. Food Red 15 ; D&C Red No. 19
CAS NO: 81-88-9
Classification Code: Agricultural Chemical ; Experimental pesticide ; Mutation data ; Reproductive Effect ; Tumor data ; Unspecified / Unclassified pesticide
Melting point: 210-211 °C
Density: 0.79 g/mL at 20 °C
Flash Point:  12 °C
Storage temp: Store at RT.
Colour Index: 45170
Water Solubility: SOLUBLE
BRN: 4119648
Stability: Stable. Incompatible with strong oxidizing agents.

  Rhodamine B (CAS NO.81-88-9) is used as dye, esp for paper, as reagent for antimony, bismuth, cobalt, niobium, gold, manganese, mercury, molybdenum, tantalum, thallium, tungsten, as biological stain.

Hazard Codes of Rhodamine B (CAS NO.81-88-9): Xn,Xi,F
Risk Statements: 22-41-68-67-36-11
R22: Harmful if swallowed. 
R41: Risk of serious damage to the eyes. 
R68: Possible risk of irreversible effects. 
R67: Vapours may cause drowsiness and dizziness. 
R36: Irritating to eyes. 
R11: Highly flammable.
Safety Statements: 7-16-24/25-26-36/37/39 
S7: Keep container tightly closed. 
S16: Keep away from sources of ignition. 
S24/25: Avoid contact with skin and eyes. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection.
WGK Germany: 2
 

Stability: Stable at room temperature in closed containers under normal storage and handling conditions.
Storage：Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances
Handling：Wash thoroughly after handling. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse.
First Aid Measures:
Ingestion: If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
Inhalation: Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Skin: Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.