Is CI 42100 (Acid Green 9 / Steel Blue) safe in cosmetics?
CI 42100 (Acid Green 9 / Steel Blue) has a safety rating of "MODERATE" in our database. EU status: restricted. US status: prohibited.
MODERATE
Cosmetic Ingredient
CI 42100 (Acid Green 9 / Steel Blue)
Also known as: Acid Brilliant Green 6B, Acid Green 5B, Erio Viridine B, Brilliant Acid Green 6B, Dinacid Milling Green B
INCI: CI 42100
CI 42100 (Acid Green 9 / Steel Blue) (CAS 4857-81-2) is a cosmetic cosmetic ingredient functioning as Colorant. Synthetic triphenylmethane dye (Acid Green 9 / Steel Blue). EU Regulation 1223/2009 status: restricted, max Annex IV, Entry IV/64; restricted to rinse-off applications only. No maximum concentration specified for permitted rinse-off applications.. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
Function
Colorant. Synthetic triphenylmethane dye (Acid Green 9 / Steel Blue). Water-soluble anionic sulfonated triphenylmethane dye. Permitted under EU Annex IV for rinse-off cosmetic applications only.
Editorial assessment
MODERATE
Preliminary editorial note — not a computed safety verdict.
Chemistry & Identifiers
IUPAC Name
sodium 3-[[4-[(2-chlorophenyl)-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]-N-ethylanilino]methyl]benzenesulfonate
InChIKey
SHBDDIJUSNNBLQ-UHFFFAOYSA-M
Regulatory Status
EU EU Status
restricted
EU Max Conc.
Annex IV, Entry IV/64; restricted to rinse-off applications only. No maximum concentration specified for permitted rinse-off applications.
US US Status
prohibited
US Notes
CI 42100 is not listed on the FDA Color Additives Permitted for Use in Cosmetics (21 CFR Parts 73, 74, or 82). Use in US cosmetics is not authorized.
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for CI 42100 (Acid Green 9 / Steel Blue).
Calculate MoS for your specific formulation with the MoS Calculator.
EU CosIng Annex Listing
European Commission CosIng database Annex references per Regulation (EC) No 1223/2009.
Annex IV — Permitted Colorants
Product type: Green
Expanded Jurisdictional Detail
Additional regulatory detail beyond the 7-jurisdiction summary: Saudi SFDA, Korea MFDS, ASEAN ACD, Japan/Korea, Brazil/India, and cross-jurisdictional restriction entries.
SA Saudi SFDA (IV - Colorants)
Product type: Rinse-off products.
BRIN Brazil/India Cosmetics
India: Permitted Colorant
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Dye
Editorial summary
Preliminary editorial summary for CI 42100 (Acid Green 9 / Steel Blue) — not a computed safety verdict. See the sourced toxicological data above.
Regulatory Flags
eu-annex-iv
rinse-off-only-eu
not-fda-listed
no-us-authorization
triphenylmethane-dye
water-soluble
sulfonated
leave-on-prohibited-eu
green-dye
acid-green-9
Known Synonyms
Acid Brilliant Green 6B
Acid Green 5B
Erio Viridine B
Brilliant Acid Green 6B
Dinacid Milling Green B
Chemical Function
Dye
Australian Status
AICIS status: listed
Frequently Asked Questions
Is CI 42100 (Acid Green 9 / Steel Blue) allowed in the EU?
CI 42100 (Acid Green 9 / Steel Blue) EU regulatory status: restricted. Maximum allowed concentration: Annex IV, Entry IV/64; restricted to rinse-off applications only. No maximum concentration specified for permitted rinse-off applications.. This is based on EU Regulation 1223/2009 and its amendments.
What does CI 42100 (Acid Green 9 / Steel Blue) do in cosmetics?
CI 42100 (Acid Green 9 / Steel Blue) functions as: Colorant. Synthetic triphenylmethane dye (Acid Green 9 / Steel Blue). Water-soluble anionic sulfonated triphenylmethane dye. Permitted under EU Annex IV for rinse-off cosmetic applications only.. It is classified as a cosmetic ingredient in our database. CAS number: 4857-81-2.
Is CI 42100 (Acid Green 9 / Steel Blue) used outside cosmetics?
CI 42100 (Acid Green 9 / Steel Blue) also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Compliance Tools
Check CI 42100 (Acid Green 9 / Steel Blue) compliance across multiple jurisdictions:
Ingredient Decoder
Paste a full ingredient list for instant analysis
82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
Compare limits across jurisdictions
Related Ingredients
CI 40800 (Beta-Carotene)
EXCELLENT
Same category
Colorant. Synthetic or naturally deri...
CI 75130 (Beta-Carotene)
EXCELLENT
Same category
Colorant. Synthetic or plant-derived ...
CI 75170 (Guanine)
EXCELLENT
Same category
Colorant. Natural crystalline materia...
CI 77004 (Kaolin)
EXCELLENT
Same category
Colorant. Natural white clay mineral ...
CI 77007 (Ultramarine Blue)
EXCELLENT
Same category
Colorant. Inorganic mineral pigment s...
CI 77019 (Mica)
EXCELLENT
Same category
Colorant; Opacifying Agent; Bulking A...
(20S)-Protopanaxadiol
MODERATE
Similar safety
(Cnidium Officinale/Coptis Chinensis/Glycyrrhiza Uralensis) Root Extract
MODERATE
Similar safety
Skin conditioning
(Cryptomeria Japonica/Chamaecyparis Obtusa) Stem Ferment Extract
MODERATE
Similar safety
Antimicrobial, antioxidant, humectant
(Eclipta Prostrata/Houttuynia Cordata) Leaf Extract
MODERATE
Similar safety
Skin conditioning
(Lepidium Meyenii/Sarcodon Aspratus) Root Water
MODERATE
Similar safety
Skin conditioning
(Licorice/Reynoutria Japonica) Root/Stem Extract
MODERATE
Similar safety
Skin conditioning, antioxidant
Calcium Hydroxymethionine
MODERATE
Chemical family
Skin conditioning, hair conditioning ...
CI 10006
MODERATE
Browse nearby
Colorant (green)
CI 10020
MODERATE
Browse nearby
Colorant (green)
Is CI 42100 (Acid Green 9 / Steel Blue) in Your Products?
Scan any product label with Piro — our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.
Try Piro Free →Analyze Your Full Ingredient List
Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for CI 42100 (Acid Green 9 / Steel Blue) in your formulation.