C.I. Direct Black 19, disodium salt

Overview IFRA Request a quote

  • Identifiers

    CAS number
    6428-31-5

    Molecular formula
    C34H27N13Na2O7S2

    SMILES
    C1=CC(=CC=C1N=NC2=C(C=C(C=C2)N)N)N=NC3=C(C4=C(C(=C(C=C4C=C3S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC5=CC=C(C=C5)N=NC6=C(C=C(C=C6)N)N)N)O.[Na+].[Na+]

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 69.49%
    Cooked 26.59%
    Savory 24.58%
    Meaty 24.11%
    Grape 21.79%
    Roasted 20.42%
    Bitter 19.89%
    Burnt 19.22%
    Fruity 18.0%
    Milky 15.1%

     

    Flavor
    Bitter 89.89%
    Odorless 35.66%
    Bland 20.73%
    Nitrile 20.12%
    Very strong 19.02%
    Taco 18.75%
    Bread crust 18.71%
    Indole 18.48%
    Roasted peanuts 18.32%
    Scallion 18.19%

     

    Odor impact est.
    Odorless

  • Properties

    pKa est.
    4.19 (weak acid)

    Molecular weight
    839.8 g/mol

    Flash point

    • 421.51 ˚C est.

  • Synonyms

    • C.I. Direct Black 19, disodium salt
    • DTXSID3064356
    • RefChem:1080555
    • DTXCID7044265
    • DIRECT BLACK 19
    • 6428-31-5
    • Viscose Black G
    • Rayon Black G
    • Direct Fast Black G
    • Indoblack GR
    • Kayarus Black G
    • Viscose Black J
    • Viscose Black N
    • Rayon Black M
    • Solar Black G
    • Visco Black N
    • Cutamin Black CG
    • Fenamin Black GR
    • Rayon Black GSN
    • Viscose Black NG
    • Sumilight Black G
    • Vondacel Black VG
    • Vondacel Black VN
    • Viscose Black GNA
    • Benzo Fast Black G
    • Rayon Fast Black B
    • Tertrodirect Black V
    • Diamine Fast Black B
    • B91N7SNH1C
    • Direct Fast Black GU
    • Direct Fast Black SA
    • Bencidal Fast Black G
    • Benzanil Fast Black G
    • Columbia Fast Black G
    • Formal Fast Black 2B
    • BALI Viscose Black G
    • BALI Viscose Black N
    • Pyrazol Fast Black GS
    • Coranil Direct Black B
    • Columbia Fast Black GB
    • Hispamin Fast Black CG
    • Direct Rayon Black KSG
    • Artificial Silk Black G
    • Benzoform Black RRA-CF
    • Artificial Silk Black GN
    • Artificial Silk Black GR
    • C.I. 35255
    • Chrome Leather Black GNA
    • Chlorazol Viscose Black B
    • Diaphtamine Fast Black KG
    • C.I. Direct Black 19
    • Phenamine Viscose Black RR
    • Tetrazo Deep Black GC Extra
    • Direct Artificial Silk Black G
    • Atlantic Artificial Silk Black G
    • 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis(2-(4-(2-(2,4-diaminophenyl)diazenyl)phenyl)diazenyl)-5-hydroxy-, sodium salt (1:2)
    • disodium;4-amino-3,6-bis[[4-[(2,4-diaminophenyl)diazenyl]phenyl]diazenyl]-5-hydroxynaphthalene-2,7-disulfonate
    • Water Black 100
    • Daiwa Black 320H
    • NSC-47758
    • Water Black 200L
    • CI Direct Black 19
    • Orient P 200
    • Water Black P 200
    • Direct Rayon Black KSQ
    • 2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis((4-((2,4-diaminophenyl)azo)phenyl)azo)-5-hydroxy-, disodium salt
    • Orient Water Black 100L
    • Orient Water Black 200L
    • CERN prima 19 [Czech]
    • CCRIS 7486
    • HSDB 4371
    • C.I. Direct Black 19 (VAN)
    • EINECS 229-208-1
    • NSC 47758
    • CERN prima 19
    • Kayarus Black G conc.
    • UNII-B91N7SNH1C
    • SCHEMBL29370376
    • AKOS024427245
    • FD44459
    • C.I. DIRECT BLACK 19 [HSDB]
    • CI 35255
    • Disodium 4-amino-3,6-bis((4-((2,4-diaminophenyl)azo)phenyl)azo)-5-hydroxynaphthalene-2,7-disulphonate
    • NS00046668
    • EC 229-208-1
    • Q27274523
    • Disodium 4-amino-3,6-bis({4-[(2,4-diaminophenyl)diazenyl]phenyl}diazenyl)-5-hydroxynaphthalene-2,7-disulfonate
    • 6428-31-5

  • Applications

    Applications of C.I. Direct Black 19, disodium salt (CAS 6428-31-5) are primarily as a colorant for textiles, particularly on cellulose fibers such as cotton and viscose. It is also used for textile printing and coloration on fabrics, and as a colorant for paper and board products. In coatings and inks, it can serve as a dye component in decorative coatings, packaging inks, and related formulations. It may also be used as a colorant in plastics and polymers (masterbatches or molded articles), depending on processing conditions and colorfastness. Use should comply with local regulations and formulation limits, and compatibility with processing conditions must be verified.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.06
    methanol 1.33
    isopropanol 0.53
    water 0.0
    ethyl acetate 0.55
    n-propanol 0.8
    acetone 2.29
    n-butanol 0.37
    acetonitrile 0.44
    DMF 12.67
    toluene 0.12
    isobutanol 0.27
    1,4-dioxane 2.75
    methyl acetate 1.21
    THF 10.97
    2-butanone 2.66
    n-pentanol 0.23
    sec-butanol 0.4
    n-hexane 0.0
    ethylene glycol 0.55
    NMP 11.57
    cyclohexane 0.0
    DMSO 11.85
    n-butyl acetate 0.4
    n-octanol 0.14
    chloroform 0.73
    n-propyl acetate 0.5
    acetic acid 3.22
    dichloromethane 0.68
    cyclohexanone 2.11
    propylene glycol 1.32
    isopropyl acetate 0.29
    DMAc 12.44
    2-ethoxyethanol 2.56
    isopentanol 0.16
    n-heptane 0.0
    ethyl formate 1.06
    1,2-dichloroethane 0.37
    n-hexanol 0.11
    2-methoxyethanol 6.27
    isobutyl acetate 0.17
    tetrachloromethane 0.04
    n-pentyl acetate 0.46
    transcutol 3.57
    n-heptanol 0.15
    ethylbenzene 0.03
    MIBK 0.25
    2-propoxyethanol 2.21
    tert-butanol 0.23
    MTBE 0.18
    2-butoxyethanol 1.58
    propionic acid 1.13
    o-xylene 0.04
    formic acid 2.36
    diethyl ether 0.29
    m-xylene 0.03
    p-xylene 0.04
    chlorobenzene 0.12
    dimethyl carbonate 0.8
    n-octane 0.0
    formamide 3.07
    cyclopentanone 6.92
    2-pentanone 0.92
    anisole 0.29
    cyclopentyl methyl ether 0.47
    gamma-butyrolactone 6.89
    1-methoxy-2-propanol 3.41
    pyridine 3.03
    3-pentanone 0.55
    furfural 6.08
    n-dodecane 0.0
    diethylene glycol 1.59
    diisopropyl ether 0.02
    tert-amyl alcohol 0.22
    acetylacetone 1.59
    n-hexadecane 0.0
    acetophenone 0.43
    methyl propionate 0.87
    isopentyl acetate 0.23
    trichloroethylene 1.34
    n-nonanol 0.16
    cyclohexanol 0.16
    benzyl alcohol 0.41
    2-ethylhexanol 0.05
    isooctanol 0.08
    dipropyl ether 0.22
    1,2-dichlorobenzene 0.07
    ethyl lactate 0.56
    propylene carbonate 1.5
    n-methylformamide 4.21
    2-pentanol 0.12
    n-pentane 0.0
    1-propoxy-2-propanol 1.39
    1-methoxy-2-propyl acetate 0.93
    2-(2-methoxypropoxy) propanol 1.28
    mesitylene 0.01
    ε-caprolactone 1.94
    p-cymene 0.02
    epichlorohydrin 5.11
    1,1,1-trichloroethane 0.15
    2-aminoethanol 1.1
    morpholine-4-carbaldehyde 10.45
    sulfolane 9.6
    2,2,4-trimethylpentane 0.0
    2-methyltetrahydrofuran 1.51
    n-hexyl acetate 0.44
    isooctane 0.0
    2-(2-butoxyethoxy)ethanol 1.85
    sec-butyl acetate 0.18
    tert-butyl acetate 0.25
    decalin 0.0
    glycerin 2.64
    diglyme 3.74
    acrylic acid 1.81
    isopropyl myristate 0.13
    n-butyric acid 0.93
    acetyl acetate 0.36
    di(2-ethylhexyl) phthalate 0.19
    ethyl propionate 0.33
    nitromethane 6.95
    1,2-diethoxyethane 0.76
    benzonitrile 0.31
    trioctyl phosphate 0.13
    1-bromopropane 0.15
    gamma-valerolactone 17.75
    n-decanol 0.1
    triethyl phosphate 0.12
    4-methyl-2-pentanol 0.04
    propionitrile 0.39
    vinylene carbonate 1.49
    1,1,2-trichlorotrifluoroethane 6.25
    DMS 0.44
    cumene 0.01
    2-octanol 0.09
    2-hexanone 0.67
    octyl acetate 0.24
    limonene 0.03
    1,2-dimethoxyethane 4.14
    ethyl orthosilicate 0.1
    tributyl phosphate 0.14
    diacetone alcohol 0.8
    N,N-dimethylaniline 0.15
    acrylonitrile 0.89
    aniline 0.35
    1,3-propanediol 1.44
    bromobenzene 0.08
    dibromomethane 0.26
    1,1,2,2-tetrachloroethane 0.91
    2-methyl-cyclohexyl acetate 0.18
    tetrabutyl urea 0.36
    diisobutyl methanol 0.02
    2-phenylethanol 0.26
    styrene 0.05
    dioctyl adipate 0.3
    dimethyl sulfate 1.56
    ethyl butyrate 0.34
    methyl lactate 1.43
    butyl lactate 0.7
    diethyl carbonate 0.19
    propanediol butyl ether 1.51
    triethyl orthoformate 0.31
    p-tert-butyltoluene 0.02
    methyl 4-tert-butylbenzoate 0.47
    morpholine 4.3
    tert-butylamine 0.05
    n-dodecanol 0.06
    dimethoxymethane 3.63
    ethylene carbonate 0.87
    cyrene 1.74
    2-ethoxyethyl acetate 1.17
    2-ethylhexyl acetate 0.15
    1,2,4-trichlorobenzene 0.17
    4-methylpyridine 1.25
    dibutyl ether 0.17
    2,6-dimethyl-4-heptanol 0.02
    DEF 1.21
    dimethyl isosorbide 1.89
    tetrachloroethylene 0.43
    eugenol 0.67
    triacetin 0.68
    span 80 1.02
    1,4-butanediol 0.39
    1,1-dichloroethane 0.27
    2-methyl-1-pentanol 0.11
    methyl formate 3.44
    2-methyl-1-butanol 0.19
    n-decane 0.01
    butyronitrile 0.31
    3,7-dimethyl-1-octanol 0.07
    1-chlorooctane 0.04
    1-chlorotetradecane 0.01
    n-nonane 0.0
    undecane 0.0
    tert-butylcyclohexane 0.0
    cyclooctane 0.0
    cyclopentanol 0.57
    tetrahydropyran 1.01
    tert-amyl methyl ether 0.15
    2,5,8-trioxanonane 2.33
    1-hexene 0.03
    2-isopropoxyethanol 0.96
    2,2,2-trifluoroethanol 0.94
    methyl butyrate 0.65

    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