1-naphthalenesulfonic acid, 6-((2,4-dimethyl-6-sulfophenyl)azo)-5-hydroxy-, disodium salt

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  • Identifiers

    CAS number
    3257-28-1

    Molecular formula
    C18H14N2Na2O7S2

    SMILES
    CC1=CC(=C(C(=C1)S(=O)(=O)[O-])N=NC2=C(C3=C(C=C2)C(=CC=C3)S(=O)(=O)[O-])O)C.[Na+].[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 79.13%
    Cooked 21.2%
    Savory 19.72%
    Bitter 19.57%
    Roasted 16.68%
    Burnt 16.14%
    Grape 14.58%
    Milky 13.7%
    Meaty 13.45%
    Clean 12.99%

     

    Flavor
    Bitter 90.28%
    Odorless 32.7%
    Bland 20.99%
    Nitrile 20.34%
    Very strong 18.57%
    Taco 18.42%
    Bread crust 18.3%
    Indole 18.29%
    Roasted peanuts 17.96%
    Cedarleaf 17.75%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    3.89 (weak acid)

    Molecular weight
    480.4 g/mol

    Flash point

    • 307.65 ˚C est.

  • Synonyms

    • 1-Naphthalenesulfonic acid, 6-[(2,4-dimethyl-6-sulfophenyl)azo]-5-hydroxy-, disodium salt
    • 1-Naphthalenesulfonic acid, 6-((2,4-dimethyl-6-sulfophenyl)azo)-5-hydroxy-, disodium salt
    • DTXSID9062938
    • 1-Naphthalenesulfonic acid, 6-(2-(2,4-dimethyl-6-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2)
    • 1-Naphthalenesulfonic acid, 6-[2-(2,4-dimethyl-6-sulfophenyl)diazenyl]-5-hydroxy-, sodium salt (1:2)
    • RefChem:434928
    • DTXCID6038532
    • Scarlet GN
    • 3257-28-1
    • C.I. Food Red 2, disodium salt
    • CI 14815
    • disodium 6-[(2,4-dimethyl-6-sulphonatophenyl)azo]-5-hydroxynaphthalene-1-sulphonate
    • 92NT7608O0
    • Salmon Red Geigy
    • Cilefa Red G
    • Acid Scarlet GNA
    • Eurocert Scarlet GN
    • Sarlach GN [Czech]
    • L Red Z 3000
    • Ecarlate GN [French]
    • Ecarlate GN
    • Sarlach GN
    • Scarlet GN Specially Pure
    • Disodium 6-((2,4-dimethyl-6-sulphonatophenyl)azo)-5-hydroxynaphthalene-1-sulphonate
    • Acid Scarlet JN Extra Pure A
    • Cerven potravinarska 2 [Czech]
    • Cerven potravinarska 2
    • EINECS 221-856-3
    • C.I. 14815
    • E 125
    • UNII-92NT7608O0
    • C.I. FOOD RED 2
    • SCHEMBL340709
    • SCHEMBL29368745
    • AQJHOKDCKYSJAS-MHZTUVSFSA-L
    • Disodium 6-((2,4-dimethyl-6-sulfophenyl)azo)-5-hydroxy-1-naphthalenesulfon- ate
    • NS00046471
    • Q934310
    • Disodium 6-[(2,4-dimethyl-6-sulfonatophenyl)diazenyl]-5-hydroxynaphthalene-1-sulfonate
    • 3257-28-1

  • Applications

    Chemical name: 1-naphthalenesulfonic acid, 6-((2,4-dimethyl-6-sulfophenyl)azo)-5-hydroxy-, disodium salt; CAS 3257-28-1. This water-soluble azo dye based on a naphthalene sulfonate is commonly used as a colorant in industry. In practice, it is employed in textiles (dyeing and printing on cellulose and synthetic fibers), leather dyeing, coatings and inks, colorants for plastics and polymers, and paper coloration.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.98
    methanol 2.43
    isopropanol 1.01
    water 0.01
    ethyl acetate 2.79
    n-propanol 1.48
    acetone 10.48
    n-butanol 0.99
    acetonitrile 3.93
    DMF 28.87
    toluene 0.84
    isobutanol 0.7
    1,4-dioxane 7.92
    methyl acetate 4.44
    THF 29.31
    2-butanone 8.14
    n-pentanol 0.72
    sec-butanol 0.9
    n-hexane 0.01
    ethylene glycol 0.89
    NMP 24.05
    cyclohexane 0.04
    DMSO 22.88
    n-butyl acetate 2.25
    n-octanol 0.69
    chloroform 3.17
    n-propyl acetate 2.11
    acetic acid 3.78
    dichloromethane 3.86
    cyclohexanone 10.01
    propylene glycol 0.94
    isopropyl acetate 1.8
    DMAc 25.88
    2-ethoxyethanol 4.6
    isopentanol 0.66
    n-heptane 0.03
    ethyl formate 2.88
    1,2-dichloroethane 3.06
    n-hexanol 0.73
    2-methoxyethanol 12.07
    isobutyl acetate 0.91
    tetrachloromethane 0.18
    n-pentyl acetate 2.21
    transcutol 7.61
    n-heptanol 0.79
    ethylbenzene 0.26
    MIBK 1.85
    2-propoxyethanol 7.3
    tert-butanol 1.01
    MTBE 0.9
    2-butoxyethanol 4.22
    propionic acid 1.77
    o-xylene 0.42
    formic acid 3.2
    diethyl ether 1.28
    m-xylene 0.37
    p-xylene 0.42
    chlorobenzene 1.17
    dimethyl carbonate 3.36
    n-octane 0.02
    formamide 6.62
    cyclopentanone 20.33
    2-pentanone 4.31
    anisole 1.47
    cyclopentyl methyl ether 2.15
    gamma-butyrolactone 15.98
    1-methoxy-2-propanol 6.38
    pyridine 9.73
    3-pentanone 3.17
    furfural 13.28
    n-dodecane 0.03
    diethylene glycol 6.07
    diisopropyl ether 0.2
    tert-amyl alcohol 0.87
    acetylacetone 7.99
    n-hexadecane 0.04
    acetophenone 2.6
    methyl propionate 3.36
    isopentyl acetate 1.73
    trichloroethylene 7.16
    n-nonanol 0.8
    cyclohexanol 0.78
    benzyl alcohol 1.56
    2-ethylhexanol 0.43
    isooctanol 0.54
    dipropyl ether 0.93
    1,2-dichlorobenzene 0.98
    ethyl lactate 1.68
    propylene carbonate 4.15
    n-methylformamide 8.58
    2-pentanol 0.45
    n-pentane 0.02
    1-propoxy-2-propanol 3.97
    1-methoxy-2-propyl acetate 4.21
    2-(2-methoxypropoxy) propanol 4.66
    mesitylene 0.19
    ε-caprolactone 6.05
    p-cymene 0.33
    epichlorohydrin 17.44
    1,1,1-trichloroethane 1.23
    2-aminoethanol 1.53
    morpholine-4-carbaldehyde 19.34
    sulfolane 20.99
    2,2,4-trimethylpentane 0.01
    2-methyltetrahydrofuran 5.11
    n-hexyl acetate 2.13
    isooctane 0.01
    2-(2-butoxyethoxy)ethanol 5.69
    sec-butyl acetate 0.98
    tert-butyl acetate 1.97
    decalin 0.02
    glycerin 2.81
    diglyme 10.77
    acrylic acid 2.44
    isopropyl myristate 1.09
    n-butyric acid 2.07
    acetyl acetate 2.07
    di(2-ethylhexyl) phthalate 1.61
    ethyl propionate 1.8
    nitromethane 13.96
    1,2-diethoxyethane 2.99
    benzonitrile 2.77
    trioctyl phosphate 1.06
    1-bromopropane 0.87
    gamma-valerolactone 26.88
    n-decanol 0.64
    triethyl phosphate 0.98
    4-methyl-2-pentanol 0.26
    propionitrile 2.96
    vinylene carbonate 4.32
    1,1,2-trichlorotrifluoroethane 8.68
    DMS 2.84
    cumene 0.17
    2-octanol 0.48
    2-hexanone 3.05
    octyl acetate 1.61
    limonene 0.4
    1,2-dimethoxyethane 9.76
    ethyl orthosilicate 0.83
    tributyl phosphate 1.14
    diacetone alcohol 4.05
    N,N-dimethylaniline 0.89
    acrylonitrile 5.81
    aniline 1.53
    1,3-propanediol 2.7
    bromobenzene 0.91
    dibromomethane 1.8
    1,1,2,2-tetrachloroethane 4.51
    2-methyl-cyclohexyl acetate 1.58
    tetrabutyl urea 2.82
    diisobutyl methanol 0.29
    2-phenylethanol 2.23
    styrene 0.39
    dioctyl adipate 2.01
    dimethyl sulfate 5.24
    ethyl butyrate 1.74
    methyl lactate 3.25
    butyl lactate 2.2
    diethyl carbonate 1.24
    propanediol butyl ether 2.66
    triethyl orthoformate 1.44
    p-tert-butyltoluene 0.3
    methyl 4-tert-butylbenzoate 3.49
    morpholine 9.23
    tert-butylamine 0.31
    n-dodecanol 0.47
    dimethoxymethane 11.97
    ethylene carbonate 3.01
    cyrene 5.36
    2-ethoxyethyl acetate 4.42
    2-ethylhexyl acetate 1.28
    1,2,4-trichlorobenzene 1.74
    4-methylpyridine 5.07
    dibutyl ether 0.8
    2,6-dimethyl-4-heptanol 0.29
    DEF 4.82
    dimethyl isosorbide 9.18
    tetrachloroethylene 2.34
    eugenol 4.45
    triacetin 3.02
    span 80 3.16
    1,4-butanediol 0.81
    1,1-dichloroethane 1.64
    2-methyl-1-pentanol 0.53
    methyl formate 7.91
    2-methyl-1-butanol 0.65
    n-decane 0.05
    butyronitrile 2.19
    3,7-dimethyl-1-octanol 0.52
    1-chlorooctane 0.32
    1-chlorotetradecane 0.17
    n-nonane 0.04
    undecane 0.04
    tert-butylcyclohexane 0.01
    cyclooctane 0.01
    cyclopentanol 1.73
    tetrahydropyran 3.63
    tert-amyl methyl ether 0.79
    2,5,8-trioxanonane 8.92
    1-hexene 0.12
    2-isopropoxyethanol 2.28
    2,2,2-trifluoroethanol 1.45
    methyl butyrate 2.5

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction