Is Basic Blue 9 vegan?
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 vegan if it contains no animal-derived components at any point in its production.
Classifications are made to the best of our knowledge based on available scientific and regulatory sources. We cannot guarantee the accuracy of every entry, errors in the sources we draw from can always occur. This tool also cannot account for cross-contamination, which depends entirely on individual suppliers and producers. If you believe a classification is incorrect, you can report an issue.
