Pigments & Colorants
REACH
Acid Blue 3
CAS Number
3536-49-0
EC Number
222-573-8
E Number
E131
What is Acid Blue 3?
Acid Blue 3 (CAS 3536-49-0), also known as Patent Blue V and E131, is a synthetic triarylmethane dye used to impart vivid blue coloration.
Where is Acid Blue 3 used?
- Food and beverage: coloring confectionery, soft drinks and ice cream
- Cosmetics and personal care: blue tones in shampoos, bath products and toothpaste
- Printing and packaging: dye component in water-based inks for color intensity and substrate adhesion
- Textile and leather processors use it in aqueous dyebaths for protein-based fibers and finished leather goods.
Good to know: Food and cosmetic grades conform to E131 specifications, with purity aligned to EU and Codex Alimentarius frameworks; technical grade is for non-consumable applications such as textile dyeing and ink formulation.
Other Names (Synonyms)
Calcium bis(4-[[4-(diethylamino)phenyl]-(4-diethylazaniumylidenecyclohexa-2,5-dien-1-ylidene)methyl]-6-hydroxybenzene-1,3-disulfonate)|Patent blue v|E131
What are the physical properties of Acid Blue 3?
Melting Point 200 °C
Color Brown to black
Form neat
Water Solubility 20.98g/L@20°C
Log P -1.99 at 25℃
Which trade and regulatory codes apply to Acid Blue 3?
Storage Class 11 - Combustible Solids
WGK (Germany) 3