Is Vat Red 41 vegan?
Vat Red 41
Thioindigo is a synthetic organosulfur dye used to dye polyester fabric. It is structurally related to the plant-derived dye indigo, with the two NH groups replaced by two sulfur atoms, producing a pink shade. It is manufactured entirely from synthetic precursors.
| Also known as | Benzo[b]thiophen-3(2H)-one, 4,7-dichloro-2-(4,7-dichloro-3-oxobenzo[b]thien-2(3H)-ylidene)-, DyStar, Vat Red 41 |
|---|---|
| INCI name | Vat Red 41 |
| CAS number | 522-75-8 |
| EC number | 238-222-7 |
| CI number | CI 73300 |
| CosIng ID | 59407 |
| 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.
