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Is Direct Yellow 4 vegan?

Direct Yellow 4 is a synthetic direct dis-azo dye with the formula C26H18N4Na2O8S2. It is a stilbene-based diamine derivative considered one of the most important dyes in its class due to its strength and value. It can also function as an acid-base indicator, deepening from yellow through orange to red in the pH range 6.4 to 8.0.

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.