What does Sodium bromothymol blue do?

Used in cosmetics as a hair dye.

Is Sodium bromothymol blue safe?

We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

beauty
industrial

Sodium bromothymol blue

CAS 1217249-89-2

Also registered as 9 other CAS numbers

33551-93-8 · 223272-01-3 · 271766-05-3 · 1007478-27-4 · 1017687-43-2 · 1173527-57-5 · 1190057-84-1 · 1202866-89-4 · 34722-90-2

Sodium bromothymol blue chemical structure

Concern score

Not assessed — no hazard data yet.

Sodium bromothymol blue in plain language

What it is: Also known as Bromthymol blue sodium salt · Bromthymol blue sodium · 3',3''-dibromothymolsulfonephthalein sodium salt · AKOS024364981 · water soluble Bromothymol blue · Bromthymolblau Natriumsalz
Show all 13 names
D92219 · Q27275439 · SBB006520 · SBB057273 · ST057215 · bromothymol blue sodium salt · bromthymol blue
What it does: Used in cosmetics as a hair dye.
Hair dyeing
Is it a concern?: We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. Sodium bromothymol blue appears in these published regulatory listings.

Recorded in these product areas

Found in consumer products
Beauty
Industrial

EUCosIngActiveSodium Bromothymol Blue is the organic compound that conforms to the formula:
- Sodium Bromothymol Blue is the organic compound that conforms to the formula:Source →
USEPAcommercial use observedEPA CPDat observed this chemical in 25 composition records across product categories including Laboratory supplies, Personal care.
- EPA CPDat observed this chemical in 25 composition records across product categories including Laboratory supplies, Personal care.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 Sodium bromothymol blue. 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 Sodium bromothymol blue yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

CosIng
regulatory · updated 2026-09-23
Open →
EPA Chemical and Products Database
exposure · updated 2019-02-27
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
Open →
PubChem Live Enrichment
chemistry · updated 2026-05-17
Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

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.

Where it has been recorded

How often EPA CPDat has listed Sodium bromothymol blue in a product composition. These are source records, not Greenveil catalog products.

Source records

Laboratory suppliesPersonal care

Typical roles

Hair dyeing

See products using Sodium bromothymol blue →