The ingredient, explained
Ci 42090
A published expert safety assessment covers the exact ingredient in the specified exposure context.
Ingredient guide
What it is and what it does
Dihydrogen -ethyl-[4-[4-[ethyl-3-sulphonatobenzyl-]amino]-2'-sulphonatobenzhydrylidene]cyclohexa-2‚5-dien-1-ylidene]-3-sulphonatobenzyl-ammonium, disodium salt
About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗
- Cosmetic colorant
- Adds colour to a product or the surface where it is applied.
Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗
Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.
A closer look
What the research shows
Safety assessment
EFSA established an oral acceptable daily intake of 6 mg/kg body weight/day using chronic rat toxicology and uncertainty factors.
What this does not tell us
Food additive assessment and oral exposure estimates, not topical cosmetic benefit or skin tolerance. Some high child intake estimates exceeded the ADI.
Sources for this summary. DOI 10.2903/j.efsa.2010.1853 ↗
Research review checked Oct 1, 2026
Bounded review of local candidates, exact-name indexed primary journal/PubMed safety and topical searches; not a systematic review.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Safety assessment
Scientific Opinion on the re-evaluation of Brilliant Blue FCF (E 133) as a food additive ↗
· 2010
Follow the formula
Products containing this ingredient
From the wider catalogue. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
Registry identity
Dihydrogen -ethyl-[4-[4-[ethyl-3-sulphonatobenzyl-]amino]-2'-sulphonatobenzhydrylidene]cyclohexa-2‚5-dien-1-ylidene]-3-sulphonatobenzyl-ammonium, disodium salt
- INCI name on ingredient lists
- CI 42090
- CAS registry number
- 3844-45-9
- EC number
- 223-339-8
Sources for this ingredient record
- EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗ · ODbL 1.0 (Open Beauty Facts database) · Recorded Aug 8, 2026