Indigo Carmine 85% Dye Content | CAS 860-22-0 | Acid Blue 74

Indigo Carmine, Certified by BSC, Dye Content 85% - 25g

SKU: 131164-25G
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For laboratory, institutional, and professional use only. Not available for residential or personal purchase. Orders are subject to verification.

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Indigo Carmine (Acid Blue 74; Indigo-5,5′-disulfonic acid disodium salt) is a synthetic blue dye supplied with 85% dye content and certified by the BSC. This indigoid dye is widely used in analytical chemistry, diagnostic assay manufacturing, hematology, histology, and as a redox indicator.

With defined absorbance characteristics (λmax 608 nm) and spectral data in aqueous solution, Indigo Carmine is suitable for laboratory, staining, and photometric applications requiring controlled dye purity and performance.

Chemical Name: Indigo Carmine
Synonyms: Acid Blue 74; Indigo-5,5′-disulfonic acid disodium salt; Indigocarmine
Empirical Formula: C₁₆H₈N₂Na₂O₈S₂
CAS Number: 860-22-0
Molecular Weight: 466.35 g/mol
Colour Index Number: 73015
Dye Content: 85%
Assay: >85.0% (HPLC)
Form: Solid
Color: Dark blue to very dark blue
λmax: 608 nm
εmax: 20,000 (250–256 nm, water, 0.01 g/L); 29,500 (284–290 nm, water, 0.01 g/L)
pH: 3.87 (30 °C, 7.14 g/L)
Melting Point: ≥340 °C
Density: 0.71 g/cm³ at 29 °C
Storage Temperature: Room temperature
Agency Certification: Certified by BSC
UNSPSC Code: 12171500
NACRES: NA.47
PubChem Substance ID: 24847997
EC Number: 212-728-8
Beilstein/REAXYS Number: 4103904
MDL Number: MFCD00005723
InChI Key: KHLVKKOJDHCJMG-QDBORUFSSA-L
Quality Level: 200

Specifications

Indigo Carmine, Certified by BSC

• Dye content: 85%
• Assay: >85.0% (HPLC)
• Form: Solid
• Color: Dark blue to very dark blue
• λmax: 608 nm
• Melting point: ≥340 °C
• pH (7.14 g/L): 3.87 at 30 °C
• Storage: Room temperature
• Quality level: 200

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