Solvent Red 23

Description

Solvent Red 23 · CAS 85-86-9 · C22H16N4O. UNII ND733RX3JN. LogP: 2.11; Ionization Efficiency: 3.66; Ionization Efficiency: 2.7.

Identification

CAS Registry Number	85-86-9
PubChem CID	62331
Molecular formula	C22H16N4O
IUPAC name	1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-ol
UNII (FDA)	ND733RX3JN

Computed Descriptors

Molecular Weight	352.4
XLogP3	5.9
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	4
Exact Mass	352.13241115
Monoisotopic Mass	352.13241115
Topological Polar Surface Area	69.7
Heavy Atom Count	27
Formal Charge	0

Physical & Chemical Properties

LogP	2.11
Ionization Efficiency	3.66
Ionization Efficiency	2.7
Ionization Efficiency	MeCN (80%)
Ionization Efficiency	DOI:10.1002/rcm.8545
Color Additive Status	74.1317
Color Additive Status	74.2317
Color Additive Status	74.3230
Color Additive Status	81.30
Color Additive Status	82.1317

Physical description & handling notes

• Brown and green metallic solid; [Merck Index] Red powder; [MSDSonline]
• Positive
• Agilent XCT
• Electrospray ionization
• formic acid (5.3nM)
• D&C Red No. 17

Regulatory Status

Regulatory & Food Contact	FDA Regulatory Status of Color Additives: Drugs, Cosmetics, Devices CIR / INCI: Cosmetics ingredient -> Colorant CIR / INCI: Cosmetic colorant; Hair dyeing
GHS notification summary	77.8% (175 / 225)

GHS Hazard Classification

GHS notification summary	77.8% (175 / 225)
Reported hazard statements	H315 (21.3%), H318 (16.4%), H317 (100%), H335 (100%), H341 (100%), H412 (100%), H351

Documented Uses

• Used as a biological stain; [Merck Index]
• Substance listed with specific concentration in tattoo ink and/or permanent make up according to EU Commission Regulation 2020/2081. The concentration limit (by weight) is 0.1%.
• Cosmetics -> Cosmetic colorant; Hair dyeing
• Cosmetics product ingredient: 2-Naphthalenol, 1-[4-(phenylazo)phenyl]azo- (Red 17; Solvent Red 23; CI 26100; Aka225)
• Reason for Listing: Listed as Persistent, Bioaccumulative, and Inherently Toxic to the environment by the Canadian Environmental Protection Act Environmental Registry Domestic Substances List.
• Potential Health Impacts: Bioaccumulation, Environmental Persistence, and Undefined Toxicity

Synonyms

Sudan III; 85-86-9; Solvent red 23; C.I. Solvent Red 23; Toney Red; Fettponceau G; Cerasin Red; Fat Scarlet LB; Fettscharlach; Cerasinrot; Fettrot; Sudan Red III; Rouge cerasine; Stearix Scarlet; Pyronalrot B; Sudan P III

Frequently Asked Questions

What are the CAS number and molecular formula of Solvent Red 23?

CAS 85-86-9; molecular formula C22H16N4O; molecular weight — g/mol.

What other names is Solvent Red 23 known by?

Sudan III, 85-86-9, Solvent red 23, C.I. Solvent Red 23, Toney Red, Fettponceau G.

What is the regulatory status of Solvent Red 23?

Documented regulatory listings: FDA Regulatory Status of Color Additives: Drugs, Cosmetics, Devices; CIR / INCI: Cosmetics ingredient -> Colorant; CIR / INCI: Cosmetic colorant; Hair dyeing.

Is Solvent Red 23 classified as hazardous?

77.8% of GHS notifications report no hazard classification (175 of 225).

What are the key physical properties of Solvent Red 23?

LogP: 2.11; Ionization Efficiency: 3.66; Ionization Efficiency: 2.7; Ionization Efficiency: MeCN (80%).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.