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2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid (1:100 diluted with K2SO4)
(CAS RN:3737-95-9 Product Number:H0250)


2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid
Synonym Calcon-carboxylic Acid (1:100 diluted with K2SO4)
Synonym Cal Red (1:100 diluted with K2SO4)

General Information

Product Number H0250

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Purity/Analysis Method
Storage Temperature
M.F. / M.W. C21H14N2O7S=438.41
CAS RN 3737-95-9
Related CAS RN
MDL Number MFCD00004078
Packaging and Container
  • Product Details
  • Safety & Regulations


Absorbance 0.600 to 0.800(Methanol, 550.0 to 560.0 nm)
Sensitiveness Colorimetric Test : Turn Purple with Calcium and turn Blue by adding EDTA 2Na


Reaxys-RN 727492
PubChem SID 87570678
EC Number 223-117-0


Signal Word Warning
Hazard Statements
  • H315
  • :Causes skin irritation.
  • H319
  • :Causes serious eye irritation.
Precautionary Statements
  • P264
  • :Wash hands and face thoroughly after handling.
  • P280
  • :Wear protective gloves, eye protection.
  • P302+P352+P332+P313+P362+P364
  • :IF ON SKIN: Wash with plenty of water. If skin irritation occurs: Get medical advice or attention. Take off contaminated clothing and wash it before reuse.
  • P305+P351+P338+P337+P313
  • :IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice or attention.

Transport Information

HS Number 3822000000


PubMed Literature

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