LAKE GREEN

Description

LAKE GREEN S · CAS 5141-20-8 · C37H34N2Na2O9S3. UNII 3F7BHA64Z0. Melting Point: 288 °C (decomposes); Color Additive Status: 81.30.

Identification

CAS Registry Number	5141-20-8
PubChem CID	21223
Molecular formula	C37H34N2Na2O9S3
IUPAC name	disodium;3-[[N-ethyl-4-[[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]-(4-sulfonatophenyl)methyl]anilino]methyl]benzenesulfonate
UNII (FDA)	3F7BHA64Z0

Computed Descriptors

Molecular Weight	792.9
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	10
Rotatable Bond Count	9
Exact Mass	792.12218275
Monoisotopic Mass	792.12218275
Topological Polar Surface Area	203
Heavy Atom Count	53
Formal Charge	0
Complexity	1500

Physical & Chemical Properties

Melting Point	288 °C (decomposes)
Color Additive Status	81.30

Physical description & handling notes

• Deep-purple powder
• Reddish-brown powder
• In 2-methoxyethanol 100 mg/mL, ethanol 2 mg/mL, temperature not specified
• Soluble in water to a green solution which turns yellowish-brown with HCL and then gradually fades. Addition of NaOH almost completely decolorizes the solution yielding a dull violet preticipate.
• In water, 100 mg/mL, temperature not specified
• When heated to decomposition it emits very toxic fumes of /nitrogen and sulfur oxides as well as sodium monoxide/.

Regulatory Status

Regulatory & Food Contact	FDA Substance added to food: Use unspecified COLOUR: Food Additives FD&C GREEN NO. 2--DELISTED FD AND C GREEN No. 2 NMRS 38/TRS 309-JECFA 8/22
GHS notification summary	25% (2 / 8)

GHS Hazard Classification

GHS notification summary	25% (2 / 8)
Reported hazard statements	H351 (75%)

Documented Uses

• Dyeing wool directly, nylon from a formic acid bath, silk from an acetic acid, formic acid or sulfuric acid bath and chromed leather. The barium lake is used in paper coatings and printing inks.
• In the past, light green SF was primarily used in food and drugs for coloring products such as gelatin desserts, maraschino cherries, ice creams and sherbets, sweets and confections, bakery product and cereals, and gelatin capsules for pharmaceutical preparations; however it is no longer believed to be used in these applications.
• Food Additives -> COLOUR -> JECFA Functional Classes
• Light Green SF is prepared commercially by condensing ethylbenzylaniline with benzaldehyde, followed by sulphonation and oxidation, and, finally, conversion to the sodium salt.
• Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl[(3-sulfophenyl)methyl]amino]phenyl](4-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo-, inner salt, sodium salt (1:2): ACTIVE
• Certification of Light Green SF for use as a color additive in foods, drugs or cosmetics was cancelled in the US in 1966 and in Japan in 1970. Light Green SF is not included in the list of colorants permitted for use in food in the European Economic Communities ...

Synonyms

Light Green SF Yellowish; Acid Green 5; C.I. Acid Green 5; A F Green No.2; D&C Green No. 2; C.I. Food Green 2; FD&C Green No. 2; D And C Green No. 4; CCRIS 889; C.I. ACID GREEN 5, DISODIUM SALT; C.I. 42095; NSC 9619; EINECS 225-906-5; UNII-3F7BHA64Z0; FD And C Green No. 2-Aluminum Lake; 3F7BHA64Z0

Frequently Asked Questions

What are the CAS number and molecular formula of LAKE GREEN S?

CAS 5141-20-8; molecular formula C37H34N2Na2O9S3; molecular weight — g/mol.

What other names is LAKE GREEN S known by?

Light Green SF Yellowish, Acid Green 5, C.I. Acid Green 5, A F Green No.2, D&C Green No. 2, C.I. Food Green 2.

What is the regulatory status of LAKE GREEN S?

Documented regulatory listings: FDA Substance added to food: Use unspecified; COLOUR: Food Additives; FD&C GREEN NO. 2--DELISTED.

Is LAKE GREEN S classified as hazardous?

25% of GHS notifications report no hazard classification (2 of 8).

What are the key physical properties of LAKE GREEN S?

Melting Point: 288 °C (decomposes); Color Additive Status: 81.30.

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.