SHEET /m/brilliant-blue-fcf · PubChem CID 19700 · CAS 3844-45-9 · REV 2026.07
Brilliant blue FCF
from sourceC37H34N2Na2O9S3 · 792.9 g/mol
Patent blue AR · Cosmetic Blue Lake · Fenazo Blue XI · Hexacol Brilliant Blue A
What is Brilliant blue FCF?
Blue 1, the blue in sports drinks and blue raspberry candy. Very little is absorbed, so a large amount tints the stool blue-green. from source
Fig. 1 · 2D structure RDKit
CCN(CC1=CC(=CC=C1)S(=O)(=O)[O-])C2=CC=C(C=C2)C(=…133 charactersThe dose makes the poison inferred
A reported rat oral LD50 for Brilliant blue FCF is 2,000 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
2,000 mg/kg · low toxicity · LD50 rat oral from source
The dose lens above scales this to a body weight.
1 more reported value
- 4,600 mg/kgLD50 · other · mouse