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Fluorescent brightener 393

CAS 36422-63-6

Also registered as 3 other CAS numbers

120366-98-5 · 2252271-38-6 · 1533-45-5

Fluorescent brightener 393 chemical structure

Concern score

Not assessed — no hazard data yet.

Fluorescent brightener 393 in plain language

What it is

Also known as 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bis · 4,4'-Bis(2-benzoxazolyl)stilbene · 2,2'-(VINYLENEDI-P-PHENYLENE)BISBENZOXAZOLE · C.I. fluorescent brightener 393 · CI 40674 · Optical brightener 1

Show all 21 names

P,P'-BIS(2-BENZOXAZOLYL)STILBENE · 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole · 2,2'-(1,2-ethenediyl)bis(4,1-phenylene)bisbenzoxazole · 2,2'-(Vinylenedi-4-phenylene)bis(benzoxazole) · 2,2'-(Vinylenedi-p-phenylene)dibenzoxazole · 2,2'-(vinylenedi-p-phenylene)-bisbenzoxazole · 2,2-(1,2-Ethenediyldi-4,1-phenylene) bisbenzoxazole · 4,4'-BIS(2-BENZOXAZOLYL)STILBENE, trans- · 4,4'-Di(benzoxazol-2-yl)stilbene · 4,4'-bis(benzoxazol-2-yl)stilbene · Benzoxazole, 2,2'-(1,2-ETHENEDIYLDI-4,1-PHENYLENE)BIS-, (e)- · Benzoxazole, 2,2'-(1,2-ethenediyldi-4,1-phenylene)bis- · Benzoxazole, 2,2'-(vinylenedi-p-phenylene)bis- · Benzoxazole, 2,2'−(1,2−ethenediyldi−4,1−phenylene)bis− · Eastobrite ob 1

What it does

Used in cosmetics as a colourant.

  • Colorant
  • Colourant
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. Fluorescent brightener 393 appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveFluorescent Brightener 393 is the organic compound.
    • Fluorescent Brightener 393 is the organic compound.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 3 composition records across product categories including Construction and building materials, Raw materials. EPA CPDat classifies this chemical for functional uses including Dye, Brightener.
    • EPA CPDat observed this chemical in 3 composition records across product categories including Construction and building materials, Raw materials. EPA CPDat classifies this chemical for functional uses including Dye, Brightener.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 Fluorescent brightener 393. 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 Fluorescent brightener 393 yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

5 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    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

    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 Fluorescent brightener 393 in a product composition. These are source records, not Greenveil catalog products.

Source records

3

Named organisations

6

Construction and building materialsRaw materials

Typical roles

ColorantColourant
See products using Fluorescent brightener 393 →