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CAS RN: 3737-95-9 | Product Number: H0250

2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic Acid (1:100 diluted with K2SO4)

  • Cal Red (1:100 diluted with K2SO4)
  • Calcon-carboxylic Acid (1:100 diluted with K2SO4)
9   ≥20 
3   ≥20 

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Product Number H0250
Molecular Formula / Molecular Weight C__2__1H__1__4N__2O__7S = 438.41  
Physical State (20 deg.C) Solid
CAS RN 3737-95-9
Reaxys Registry Number 727492
PubChem Substance ID 87570678
MDL Number


Appearance Dark red to Dark purple to Dark blue powder to crystaline
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
Properties (reference)
Pictogram Pictogram
Signal Word Warning
Hazard Statements H315 : Causes skin irritation.
H319 : Causes serious eye irritation.
Precautionary Statements P264 : Wash skin thoroughly after handling.
P280 : Wear protective gloves/ eye protection/ face protection.
P302 + P352 : IF ON SKIN: Wash with plenty of water.
P337 + P313 : If eye irritation persists: Get medical advice/ attention.
P362 + P364 : Take off contaminated clothing and wash it before reuse.
P332 + P313 : If skin irritation occurs: Get medical advice/ attention.
Related Laws: / Compliance with laws, Regulations
Enzyme Commission 223-117-0
Transport Information:
HS Number 3822000000
PubMed Literature

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