Indigo Carmine Solution *

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Acid Blue 74, Indigotindisulfonate sodium, Indigocarmine, Sodium 3,3'-dioxo-[2,2'-biindolinylidene]-5,5'-disulfonate, Indigocarmin, Indigotine, Food Blue No. 2
Indigo carmine

Indigo Carmine Solution, also known as Acid Blue 74 and Indigotindisulfonate Sodium has the chemical formula C16H8N2Na2O8S2. It appears as indigo to dark blue powder and its solution has a bluish-purple color. It is soluble in Water and Ethanol at ambient conditions. Lab Alley’s Indigo Carmine Solution contains 0.14% by weight of Phosphoric Acid, 0.08% by weight of Indigotrisulfonic Acid, Tripotassium Salt, and 99.78% by weight of Water. The color of this solution is easily discharged by Nitric Acid and Chlorates. In the United States of America (USA), Lab Alley is selling its high-quality Indigo Carmine Solution at Due to its high purity, Indigo Carmine Solution is highly recommended for use in laboratory and medical applications.

Indigo Carmine Solution | Blue Dye | Surgical Stain | Approved Food Colorant

Buy Indigo Carmine Solution | Dye And Food Colorant

Indigo Carmine Uses: Food colorant, dye tests, detect amniotic fluid leaks, chromoendscopy, cystoscopy, obstetric surgery, urologic surgery, chromopertubation, endoscopy, amniocenteses, emr, GI procedures. Indigo Carmine is used for staining and labeling degenerative discs.

Indigo Carmine has been used to dye wool directly and silk from either a formic acid or sulfuric acid bath, and that wool and nylon are printed directly. Indigo Carmine is a colorant for nylon, surgical sutures, foods and ingested drugs. As a reagent for functional kidney tests, for detection of nitrates, chlorates and in testing milk.

Other Names For Indigo Carmine: indigotine, 5,5′-indigodisulfonic acid sodium salt, Brilliant Indigo, 4 G, C.I. Acid Blue 74, C.I. 73015, Food Blue 1, FD&C Blue 2, Sicovit Indigotin 85, E132

Indigo Carmine Information From PubChem

Indigo carmine is an organic sodium salt resulting from the formal condensation of indigo carmine (acid form) with two equivalents of sodium hydroxide. It is an indicator at pH 11.5-14, changing from blue to yellow. It has a role as a food colouring, a histological dye and a two-colour indicator. It contains an indigo carmine(2-). Indigo Carmine is an indigo to dark blue powder. Indolesulfonic acid used as a dye in renal function testing for the detection of nitrates and chlorates, and in the testing of milk.

Indigo Carmine Information From Wikipedia

Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by sulfonation, which renders the compound soluble in water. It is approved for use as a food colorant in the U.S and E.U. It has the E number E132. It is also a pH indicator.

Indigo carmine in a 0.2% aqueous solution is blue at pH 11.4 and yellow at 13.0. Indigo carmine is also a redox indicator, turning yellow upon reduction. Another use is as a dissolved ozone indicator through the conversion to isatin-5-sulfonic acid. This reaction has been shown not to be specific to ozone, however: it also detects superoxide, an important distinction in cell physiology.[5] It is also used as a dye in the manufacturing of capsules.

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment. INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing. INGESTION: DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital. 


Indigo Carmine Features:

Melting Point >300 °C (572 °F)
Solubility In Water 10 g/L (25 °C (77 °F))
Common Uses
  • Reagent
  • Food colorant
  • Diagnostic agent
  • Medical applications
Safety and Handling

Please contact us to request a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for Indigo Carmine Solution.

Indigo Carmine Safety And First Aid Information From PubChem

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