Regulatory Status
For full compliance data across 55 jurisdictions, use the Substance Compliance tool.
Safety Data
Calculate MoS for your specific formulation with the MoS Calculator.
Expert Verdict
Polyazo dye that may release regulated arylamines via reductive cleavage; no cosmetic safety evaluation exists; industrial textile dye only; do not formulate
Regulatory Flags
Frequently Asked Questions
Is Direct Black 51 safe in cosmetics?
Polyazo dye that may release regulated arylamines via reductive cleavage; no cosmetic safety evaluation exists; industrial textile dye only; do not formulate The EU classifies Direct Black 51 as "prohibited". Safety rating: POOR.
Is Direct Black 51 allowed in the EU?
Direct Black 51 EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.
What does Direct Black 51 do in cosmetics?
Direct Black 51 functions as: Colorant. It is classified as a cosmetic ingredient in our database. CAS number: 3442-21-5.
What is the Margin of Safety for Direct Black 51?
not established The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.
Compliance Tools
Check Direct Black 51 compliance across multiple jurisdictions:
Related Ingredients
Is Direct Black 51 in Your Products?
Scan any product label with Piro — our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.
Try Piro Free →Analyze Your Full Ingredient List
Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Direct Black 51 in your formulation.