Acid red 163

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  • Identifiers

    CAS number
    13421-53-9

    Molecular formula
    C44H34N4Na2O12S3

    SMILES
    C1CCC(CC1)(C2=CC=C(C=C2)N=NC3=C(C=C4C=CC(=CC4=C3O)O)S(=O)(=O)[O-])C5=CC=C(C=C5)N=NC6=C(C=C7C=CC(=CC7=C6O)OS(=O)(=O)C8=CC=CC=C8)S(=O)(=O)[O-].[Na+].[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 70.93%
    Cooked 22.1%
    Fruity 21.37%
    Savory 19.56%
    Bitter 19.45%
    Grape 17.56%
    Burnt 15.24%
    Milky 14.6%
    Clean 14.46%
    Fatty 14.05%

     

    Flavor
    Bitter 94.05%
    Odorless 29.03%
    Bland 20.62%
    Nitrile 20.13%
    Very strong 18.36%
    Indole 18.09%
    Cedarleaf 17.9%
    Lovage 17.66%
    Sweet-like 17.66%
    Bread crust 17.48%

     

    Odor impact est.
    Odorless

  • Properties

    pKa est.
    5.89 (weak acid)

    Molecular weight
    952.9 g/mol

    Flash point

    • 428.93 ˚C est.

  • Synonyms

    • Acid red 163
    • 13421-53-9
    • CI 24790
    • JUA3Q83L2E
    • Disodium 4,6-dihydroxy-3-((4-(1-(4-((1-hydroxy-7-((phenylsulphonyl)oxy)-3-sulphonato-2-naphthyl)azo)phenyl)cyclohexyl)phenyl)azo)naphthalene-2-sulphonate
    • disodium 4,6-dihydroxy-3-[[4-[1-[4-[[1-hydroxy-7-[(phenylsulphonyl)oxy]-3-sulphonato-2-naphthyl]azo]
    • disodium;3-[[4-[1-[4-[[7-(benzenesulfonyloxy)-1-hydroxy-3-sulfonatonaphthalen-2-yl]diazenyl]phenyl]cyclohexyl]phenyl]diazenyl]-4,6-dihydroxynaphthalene-2-sulfonate
    • EINECS 236-531-1
    • C.I. Acid Red 163, disodium salt
    • UNII-JUA3Q83L2E
    • CI ACID RED 163
    • SUPRANOL FAST RED BR
    • SCHEMBL340684
    • C.I. ACID RED 163
    • SCHEMBL10639240
    • ICJJDVBQIHZVGO-FDVDQXEGSA-L
    • DTXSID501021519
    • CI ACID RED 163, DISODIUM SALT
    • 2-Naphthalenesulfonicacid,4,6-dihydroxy-3-[[4-[1-[4-[[1-hydroxy-7-[(phenylsulfonyl)oxy]-3-sulfo-2-naphthalenyl]azo]phenyl]cyclohexyl]phenyl]azo]-,disodium salt (9CI)
    • C.I. 24790
    • NS00013492
    • 2-Naphthalenesulfonic acid, 4,6-dihydroxy-3-((4-(1-(4-((1-hydroxy-7-((phenylsulfonyl)oxy)-3-s- ulfo-2-naphthalenyl)azo)phenyl)cyclohexyl)phenyl)azo)-, disodium salt
    • 2-NAPHTHALENESULFONIC ACID, 4,6-DIHYDROXY-3-((4-(1-(4-((1-HYDROXY-7-((PHENYLSULFONYL)OXY)-3-SULFO-2-NAPHTHALENYL)AZO)PHENYL)CYCLOHEXYL)PHENYL)AZO)-, DISODIUM SALT
    • 2-NAPHTHALENESULFONIC ACID, 4,6-DIHYDROXY-3-(2-(4-(1-(4-(2-(1-HYDROXY-7-((PHENYLSULFONYL)OXY)-3-SULFO-2-NAPHTHALENYL)DIAZENYL)PHENYL)CYCLOHEXYL)PHENYL)DIAZENYL)-, SODIUM SALT (1:2)
    • 4,6-Dihydroxy-3-((4-(1-(4-((1-hydroxy-7-((phenylsulfonyl)oxy)-3-s- ulfo-2-naphthalenyl)azo)phenyl)cyclohexyl)phenyl)azo)-2-naphthale- nesulfonic acid, disodium salt
    • Sodium 3-((4-(1-(4-((1,7-dihydroxy-3-sulfonatonaphthalen-2-yl)diazenyl)phenyl)cyclohexyl)phenyl)diazenyl)-4-hydroxy-6-((phenylsulfonyl)oxy)naphthalene-2-sulfonate
    • 13421-53-9

  • Applications

    Acid red 163 (CAS 13421-53-9) is a water-soluble azo dye primarily used as an acid dye for protein fibers, enabling vivid coloration of wool and silk (and often nylon) under acidic bath conditions. It is also employed in leather dyeing to achieve red hues on finished goods. In industrial coatings and printing inks, it serves as a colorant in water-based formulations compatible with acid-dye chemistry. Additionally, the dye can be used to color certain plastics and polymer blends where processing and formulation permit dye uptake. Its use is typically formulation- and regulation-dependent.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.0
    methanol 1.54
    isopropanol 0.58
    water 0.01
    ethyl acetate 1.11
    n-propanol 0.86
    acetone 4.54
    n-butanol 0.43
    acetonitrile 1.0
    DMF 21.23
    toluene 0.43
    isobutanol 0.4
    1,4-dioxane 4.87
    methyl acetate 2.57
    THF 15.95
    2-butanone 3.96
    n-pentanol 0.3
    sec-butanol 0.53
    n-hexane 0.01
    ethylene glycol 0.76
    NMP 20.78
    cyclohexane 0.02
    DMSO 13.58
    n-butyl acetate 0.95
    n-octanol 0.32
    chloroform 5.44
    n-propyl acetate 1.05
    acetic acid 4.92
    dichloromethane 4.08
    cyclohexanone 4.33
    propylene glycol 1.17
    isopropyl acetate 0.8
    DMAc 23.51
    2-ethoxyethanol 2.45
    isopentanol 0.25
    n-heptane 0.01
    ethyl formate 1.66
    1,2-dichloroethane 1.75
    n-hexanol 0.21
    2-methoxyethanol 5.49
    isobutyl acetate 0.43
    tetrachloromethane 0.27
    n-pentyl acetate 1.18
    transcutol 3.9
    n-heptanol 0.3
    ethylbenzene 0.14
    MIBK 0.64
    2-propoxyethanol 2.78
    tert-butanol 0.43
    MTBE 0.48
    2-butoxyethanol 1.94
    propionic acid 2.01
    o-xylene 0.22
    formic acid 2.87
    diethyl ether 0.49
    m-xylene 0.17
    p-xylene 0.2
    chlorobenzene 0.71
    dimethyl carbonate 2.45
    n-octane 0.01
    formamide 4.28
    cyclopentanone 12.5
    2-pentanone 1.53
    anisole 0.86
    cyclopentyl methyl ether 1.27
    gamma-butyrolactone 13.8
    1-methoxy-2-propanol 3.53
    pyridine 5.84
    3-pentanone 1.3
    furfural 11.09
    n-dodecane 0.01
    diethylene glycol 2.09
    diisopropyl ether 0.08
    tert-amyl alcohol 0.43
    acetylacetone 3.83
    n-hexadecane 0.01
    acetophenone 1.44
    methyl propionate 1.95
    isopentyl acetate 0.66
    trichloroethylene 7.56
    n-nonanol 0.37
    cyclohexanol 0.39
    benzyl alcohol 0.96
    2-ethylhexanol 0.14
    isooctanol 0.21
    dipropyl ether 0.44
    1,2-dichlorobenzene 0.58
    ethyl lactate 1.07
    propylene carbonate 3.65
    n-methylformamide 6.23
    2-pentanol 0.2
    n-pentane 0.01
    1-propoxy-2-propanol 1.8
    1-methoxy-2-propyl acetate 2.04
    2-(2-methoxypropoxy) propanol 2.16
    mesitylene 0.07
    ε-caprolactone 4.03
    p-cymene 0.12
    epichlorohydrin 11.27
    1,1,1-trichloroethane 1.18
    2-aminoethanol 1.19
    morpholine-4-carbaldehyde 17.17
    sulfolane 18.27
    2,2,4-trimethylpentane 0.01
    2-methyltetrahydrofuran 2.56
    n-hexyl acetate 1.18
    isooctane 0.0
    2-(2-butoxyethoxy)ethanol 2.51
    sec-butyl acetate 0.52
    tert-butyl acetate 0.86
    decalin 0.01
    glycerin 2.8
    diglyme 4.98
    acrylic acid 3.42
    isopropyl myristate 0.4
    n-butyric acid 1.54
    acetyl acetate 1.24
    di(2-ethylhexyl) phthalate 0.63
    ethyl propionate 0.85
    nitromethane 11.82
    1,2-diethoxyethane 1.28
    benzonitrile 0.98
    trioctyl phosphate 0.39
    1-bromopropane 0.46
    gamma-valerolactone 22.37
    n-decanol 0.24
    triethyl phosphate 0.45
    4-methyl-2-pentanol 0.1
    propionitrile 0.89
    vinylene carbonate 4.17
    1,1,2-trichlorotrifluoroethane 14.06
    DMS 1.79
    cumene 0.07
    2-octanol 0.21
    2-hexanone 1.14
    octyl acetate 0.68
    limonene 0.14
    1,2-dimethoxyethane 5.03
    ethyl orthosilicate 0.39
    tributyl phosphate 0.43
    diacetone alcohol 1.74
    N,N-dimethylaniline 0.52
    acrylonitrile 2.15
    aniline 0.94
    1,3-propanediol 1.48
    bromobenzene 0.57
    dibromomethane 1.48
    1,1,2,2-tetrachloroethane 5.31
    2-methyl-cyclohexyl acetate 0.67
    tetrabutyl urea 1.02
    diisobutyl methanol 0.08
    2-phenylethanol 0.82
    styrene 0.22
    dioctyl adipate 0.89
    dimethyl sulfate 5.56
    ethyl butyrate 0.81
    methyl lactate 2.65
    butyl lactate 1.42
    diethyl carbonate 0.54
    propanediol butyl ether 1.78
    triethyl orthoformate 0.77
    p-tert-butyltoluene 0.11
    methyl 4-tert-butylbenzoate 1.59
    morpholine 6.25
    tert-butylamine 0.12
    n-dodecanol 0.16
    dimethoxymethane 6.03
    ethylene carbonate 2.47
    cyrene 3.24
    2-ethoxyethyl acetate 2.65
    2-ethylhexyl acetate 0.51
    1,2,4-trichlorobenzene 1.22
    4-methylpyridine 2.98
    dibutyl ether 0.36
    2,6-dimethyl-4-heptanol 0.08
    DEF 2.88
    dimethyl isosorbide 3.86
    tetrachloroethylene 2.7
    eugenol 1.89
    triacetin 2.14
    span 80 1.81
    1,4-butanediol 0.48
    1,1-dichloroethane 1.36
    2-methyl-1-pentanol 0.18
    methyl formate 5.43
    2-methyl-1-butanol 0.3
    n-decane 0.02
    butyronitrile 0.58
    3,7-dimethyl-1-octanol 0.2
    1-chlorooctane 0.14
    1-chlorotetradecane 0.05
    n-nonane 0.01
    undecane 0.01
    tert-butylcyclohexane 0.0
    cyclooctane 0.01
    cyclopentanol 1.14
    tetrahydropyran 1.89
    tert-amyl methyl ether 0.4
    2,5,8-trioxanonane 3.69
    1-hexene 0.05
    2-isopropoxyethanol 1.21
    2,2,2-trifluoroethanol 2.19
    methyl butyrate 1.36

    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