Fragrance avoidance
Nothing to weigh for this context yet.
We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.
- beauty
D&C blue no. 4
CAS 2650-18-2
Also registered as 2 other CAS numbers
6371-85-3 · 37307-56-5
Concern score
Not assessed — no hazard data yet.
D&C blue no. 4 in plain language
On cosmetic ingredient lists it appears as “Acid blue 9 ammonium salt”.
Also known as Acid blue 9 ammonium salt · Blue 4 · Dc blue no. 4 · Dye dc blue no. 4
Used in cosmetics as a hair dye. Acid Blue 9 Ammonium Salt is classed chemically as a triphenylmethane colour.
- Hair dyeing
- We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.
What we know about this ingredient
EPA DSSTox provides the canonical identifier, structure, and synonym profile for this chemical.
Regulation
No restrictions found. D&C blue no. 4 appears in these published regulatory listings.
EUCosIngActiveAcid Blue 9 Ammonium Salt is classed chemically as a triphenylmethane colour. It conforms to the formula: Restriction: III/190
- Acid Blue 9 Ammonium Salt is classed chemically as a triphenylmethane colour. It conforms to the formula: Restriction: III/190Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as mixture.
- openFDA substance registry classifies this ingredient as mixture.Source →
Expert safety opinions
No expert opinion on file for D&C blue no. 4. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.
SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.
Evidence & sources
No graded research studies for D&C blue no. 4 yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
No signal in this context