Fragrance avoidance
No fragrance-linked caution surfaced in the current profile.
This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.
- beauty
- cleaning
- industrial
Solvent red 24
CAS 85-83-6 · 100/100 · High conf.
Also registered as 6 other CAS numbers
8023-29-8 · 12000-52-1 · 86702-99-0 · 96510-86-0 · 104270-03-3 · 208266-18-6
Concern score
100/100Critical concern based on regulatory listings.
High confidence
Solvent red 24 in plain language
Also known as Scarlet red · C.I. Solvent Red 24 · Colouring agent CI 26105 (Solvent Red 24) · 2-NAPHTHOL, 1-(4-O-TOLYLAZO-O-TOLYLAZO)- · AKA501 · CI 26105
Show all 21 names
Fast oil red b · Oil red b · Scarlet oil · Solvent red 24 (scarlet red) · Sudan iv · 1-((4-(o-tolylazo)-o-tolyl)azo)-2-naphthol · 1-(2'-Methyl-4'-(2''-methylphenylazo)phenylazo)-2-naphthol · 1-(2-Methyl-4-(2-methylphenylazo)phenylazo)-2-naphthol · 1-(2-Methyl-4-o-tolylazo-phenylazo)-naphthalen-2-ol · 2',3-Dimethyl-4-(2-Hydroxynaphthylazo) Azobenzene · C.I. 26105 · Grasal brilliant red b · c. i. solvent red 24 · lightweight oil · organic dye (red)
Used in cosmetics as a colourant.
- Colorant
- Colourant
- Critical concern: no hazard classifications on record. It is banned in EU cosmetics.
Why it's flagged
Colouring agent CI 26105 (Solvent Red 24) is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.
RestrictedEU EC — banned
The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.
Regulation
Restrictions first, then routine listings from published regulatory sources.
- EU Annex II — prohibited
- EU prohibited in cosmetics
- Found in consumer products
- Cleaning
- Industrial
- View source →banned
EUEC
Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.
USEPAcommercial use observedEPA CPDat observed this chemical in 14 composition records across product categories including Industrial products, Arts and crafts/office supplies, Laboratory supplies. EPA CPDat classifies this chemical for functional uses including Dye.
- EPA CPDat observed this chemical in 14 composition records across product categories including Industrial products, Arts and crafts/office supplies, Laboratory supplies. EPA CPDat classifies this chemical for functional uses including Dye.Source →
USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
- openFDA substance registry classifies this ingredient as chemical.Source →
Expert safety opinions
No expert opinion on file for Solvent red 24. 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 Solvent red 24 yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Where this comes from
- Open →
CosIng
regulatory · updated 2026-09-23
- Open →
EU CosIng Cosmetics Regulation Annexes
regulatory · updated 2010-10-20
- Open →
EPA Chemical and Products Database
exposure · updated January 7, 2008
- Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
- Open →
FDA GSRS UNII
registry · updated 2026-02-26
- Open →
openFDA Substance
registry · updated 2026-05-24
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit
Where it has been recorded
How often EPA CPDat has listed Solvent red 24 in a product composition. These are source records, not Greenveil catalog products.
Source records
14
Named organisations
4
Industrial productsArts and crafts/office suppliesLaboratory suppliesSports equipmentSpecialty occupational productsRaw materials
Typical roles
ColorantColourant