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LC1907 Eriochrome blue-black B (C.I. 14640)

metal indicator


Order number Packaging Quantity Price €
AC28907 Glass bottle 25 g 22.5


Product information
Synonyms 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-naphthalene-4-sulfonic acid sodium salt
Hill Formula C20H13N2NaO5S
HS Code 3204 19 00
EC number 222-639-6
Molar mass 416.39 g/mol
CAS number 3564-14-5


Chemical and physical data
Solubility 20 g/l (20 °C)
Molar mass 416.39 g/mol
Bulk density 540 kg/m3
pH value 9.5 (10 g/l, H2O, 20 °C)


Safety information according to GHS
Hazard Statement(s) H319: Causes serious eye irritation.
Precautionary Statement(s) P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Signal Word Warning
Hazard Pictogram(s)
RTECS QK2195000
Storage class 10 – 13 Other liquids and solids
WGK WGK 2 water endangering
Disposal 3
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.


Safety information
R Phrase R 36
Irritating to eyes.
Categories of danger irritant
Hazard Symbol




Toxicological data
LD 50 oral LD50 rat > 5000 mg/kg


Identity (UV/VIS-Spectrum) passes test
Absorption maximum λ max (buffer pH 10.0) 634 – 644 nm
Spec. Absorptivity A 1%/1cm (λ7m7ax; 0.025 g/l; buffer pH 10.0; calculated on anhydrous substance) 220 – 320
Loss on drying (110 °C) ≤ 10 %
Suitability as indicator (for metal titration) passes test


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