Is Basic Blue 9 vegetarian?
Basic Blue 9
Methylene Blue (methylthioninium chloride) is a synthetic thiazine dye used both as a biological stain in histology and as a medication, primarily to treat methemoglobinemia. It has also been used historically for cyanide poisoning and urinary tract infections. In microscopy, it stains nuclei and other biological structures.
| Also known as | Basic Blue 9, Methylene Blue, methylthioninii chloridum, Methylthioninium Chloride, methylthioninum chloride, Phenothiazin-5-ium, 3,7-bis(dimethylamino)-, Phenothiazin-5-ium, 3,7-bis(dimethylamino)-, chloride (CI 52015), Solvent Blue 8, Swiss Blue |
|---|---|
| INCI name | Basic Blue 9 |
| CAS number | 61-73-4 |
| EC number | 200-515-2 |
| CI number | CI 52015 |
| CosIng ID | 32068 |
| Last reviewed | 3 June 2026 |
An ingredient is considered vegetarian if it avoids components derived from killing an animal.
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