Acid red 88

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  • Identifiers

    CAS number
    1658-56-6

    Molecular formula
    C20H13N2NaO4S

    SMILES
    C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C4=CC=CC=C43)S(=O)(=O)[O-])O.[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 64.7%
    Cooked 24.19%
    Fruity 24.01%
    Bitter 23.99%
    Grape 22.19%
    Savory 19.95%
    Burnt 19.61%
    Meaty 15.28%
    Pungent 15.23%
    Fatty 15.16%

     

    Flavor
    Bitter 92.24%
    Odorless 28.45%
    Nitrile 20.43%
    Very strong 18.91%
    Indole 18.63%
    Moth ball 17.91%
    Taco 17.73%
    Bread crust 17.68%
    Naphthelene 17.37%
    Lovage 17.36%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    6.1 (neutral)

    Molecular weight
    400.4 g/mol

    Flash point

    • 291.42 ˚C est.

  • Synonyms

    • Acid red 88
    • 1658-56-6
    • Rocceline
    • Roccelline
    • Fast red S
    • Pontacyl Fast Red AS
    • C.I. ACID RED 88
    • ACIDRED88
    • C.I. Acid Red 88, monosodium salt
    • CI 15620
    • 4-((2-Hydroxy-1-naphthalenyl)azo)1-naphthalenesulfonic acid sodium salt
    • C20H13N2NaO4S
    • 1-Naphthalenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl)azo)-, monosodium salt
    • MFCD00004070
    • 7Z2135Z4K4
    • Peony
    • Toyo roccelline
    • 4-(2-Hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid sodium salt
    • Nitto roccelline
    • Roccelline A
    • Roccelline K
    • Roccelline L
    • Roccelline S
    • Roccelline KG
    • Roccelline NS
    • Acid cardinal G
    • sodium;4-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
    • Anthrosin BRX
    • Atul Acid Fast Red A
    • Kayaku roccelline
    • Airedale Red A
    • Brasilan Red S
    • Eriosin roccelline
    • Lurazol Red E
    • Neutral Red R
    • Shikiso roccelline
    • Vondacid Red GN
    • Benzyl Red S
    • Colacid Red AV
    • Diacid Red A
    • Fenazo Red M
    • Dai-ei Roccelline
    • Tertracid Red RO
    • Benzyl Red ROC
    • Solid Red A
    • Acid Rose AV
    • Fast Acid Red G
    • Acid Red G
    • Acid Red AV
    • Azo Acid Red GS
    • Fast Red AE
    • Fast Red AG
    • Fast Red ALS
    • Fast Red AV
    • Fast Red MA
    • Naphthalene Red JS
    • Plastoresin Red RC
    • Amacid Fast Red A
    • New Red WO
    • Red J
    • 2-Naphthol Red J
    • Bucacid Fast Red A
    • Eniacid Fast Red A
    • Hidacid Fast Red A
    • Calcocid Fast Red A
    • Hispacid Fast Red A
    • Neklacid Fast Red A
    • Eriosin roccelline SS
    • Acid Red 88 (Technical Grade)
    • Acid Leather Red ROC
    • Naphtocard Fast Red C
    • Fast Red A (acid dye)
    • Drimarene turquoise X-2G
    • Red No. 506
    • 1-Naphthalenesulfonic acid, 4-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-, sodium salt (1:1)
    • 4-(2-Hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid
    • Naphthalene Red J
    • Ext D and C Red No. 8
    • 11391 Red
    • EINECS 216-760-3
    • C.I. 15620
    • UNII-7Z2135Z4K4
    • Echt Rot
    • Sodium 4(-2-hydroxy-1-naphthylazo)naphthalenesulphonate
    • AR88 dye
    • CI ACID RED 88
    • SCHEMBL342250
    • Acid Red 88, Technical grade
    • orb1986623
    • SCHEMBL9577785
    • SCHEMBL9577791
    • DTXSID1041714
    • SCHEMBL29357249
    • MSK5946
    • YCRBPWIFISBYGJ-QPNALZDCSA-M
    • Sodium 4-((2-hydroxy-1-naphthalenyl)azo)-1-naphthalenesulfonate
    • 4-((2-hydroxy-1-naphthalenyl)azo)1-naphthalenesulfonicacidsodiumsalt
    • ACID RED 88, MONOSODIUM SALT
    • AKOS000283063
    • AKOS015904107
    • AKOS037643591
    • FA41280
    • AS-17134
    • HY-118955
    • F0087
    • NS00013477
    • ST50411574
    • D90627
    • A919505
    • Q4674080
    • 4-[(2-hydroxynaphthyl)diazenyl]naphthalenesulfonic acid, sodium salt
    • SODIUM 4-((2-HYDROXY-1-NAPHTHALENYL)AZO-1-NAPHTHALENESULFONATE
    • Sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
    • sodium;4-[(2Z)-2-(2-oxo-1-naphthylidene)hydrazino]naphthalene-1-sulfonate
    • 1658-56-6

  • Applications

    Acid red 88 (CAS 1658-56-6) is primarily used as an acid dye for dyeing protein fibers such as wool and silk, and is compatible with certain polyamide (nylon) fibers. It is also employed in leather dyeing and finishing, and serves as a colorant in printing inks and industrial coatings. Additionally, acid red 88 may be used to dye plastics and other polymer materials in manufacturing processes.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 0.61
    methanol 0.7
    isopropanol 0.36
    water 0.0
    ethyl acetate 1.38
    n-propanol 0.65
    acetone 2.98
    n-butanol 0.51
    acetonitrile 0.72
    DMF 16.46
    toluene 0.9
    isobutanol 0.33
    1,4-dioxane 5.46
    methyl acetate 1.87
    THF 19.08
    2-butanone 4.25
    n-pentanol 0.43
    sec-butanol 0.5
    n-hexane 0.01
    ethylene glycol 0.28
    NMP 10.71
    cyclohexane 0.03
    DMSO 6.73
    n-butyl acetate 1.83
    n-octanol 0.47
    chloroform 1.64
    n-propyl acetate 1.3
    acetic acid 1.46
    dichloromethane 1.99
    cyclohexanone 6.74
    propylene glycol 0.38
    isopropyl acetate 1.3
    DMAc 18.53
    2-ethoxyethanol 2.19
    isopentanol 0.38
    n-heptane 0.04
    ethyl formate 1.09
    1,2-dichloroethane 1.69
    n-hexanol 0.55
    2-methoxyethanol 4.59
    isobutyl acetate 0.73
    tetrachloromethane 0.09
    n-pentyl acetate 2.05
    transcutol 9.76
    n-heptanol 0.6
    ethylbenzene 0.38
    MIBK 1.5
    2-propoxyethanol 4.42
    tert-butanol 0.45
    MTBE 0.74
    2-butoxyethanol 2.94
    propionic acid 1.0
    o-xylene 0.51
    formic acid 0.85
    diethyl ether 0.92
    m-xylene 0.43
    p-xylene 0.48
    chlorobenzene 0.81
    dimethyl carbonate 2.34
    n-octane 0.04
    formamide 2.3
    cyclopentanone 11.22
    2-pentanone 2.4
    anisole 1.42
    cyclopentyl methyl ether 2.11
    gamma-butyrolactone 8.44
    1-methoxy-2-propanol 3.34
    pyridine 6.14
    3-pentanone 2.2
    furfural 7.92
    n-dodecane 0.04
    diethylene glycol 2.97
    diisopropyl ether 0.26
    tert-amyl alcohol 0.54
    acetylacetone 4.66
    n-hexadecane 0.05
    acetophenone 2.28
    methyl propionate 2.13
    isopentyl acetate 1.76
    trichloroethylene 4.94
    n-nonanol 0.65
    cyclohexanol 0.64
    benzyl alcohol 1.25
    2-ethylhexanol 0.48
    isooctanol 0.53
    dipropyl ether 1.19
    1,2-dichlorobenzene 0.79
    ethyl lactate 1.24
    propylene carbonate 2.44
    n-methylformamide 3.4
    2-pentanol 0.33
    n-pentane 0.02
    1-propoxy-2-propanol 3.12
    1-methoxy-2-propyl acetate 4.3
    2-(2-methoxypropoxy) propanol 4.13
    mesitylene 0.24
    ε-caprolactone 4.35
    p-cymene 0.43
    epichlorohydrin 9.87
    1,1,1-trichloroethane 0.61
    2-aminoethanol 0.56
    morpholine-4-carbaldehyde 12.68
    sulfolane 11.6
    2,2,4-trimethylpentane 0.02
    2-methyltetrahydrofuran 3.23
    n-hexyl acetate 1.83
    isooctane 0.01
    2-(2-butoxyethoxy)ethanol 4.99
    sec-butyl acetate 0.96
    tert-butyl acetate 1.74
    decalin 0.03
    glycerin 1.3
    diglyme 9.68
    acrylic acid 1.4
    isopropyl myristate 1.24
    n-butyric acid 1.26
    acetyl acetate 1.27
    di(2-ethylhexyl) phthalate 1.36
    ethyl propionate 1.3
    nitromethane 5.1
    1,2-diethoxyethane 3.72
    benzonitrile 1.64
    trioctyl phosphate 0.89
    1-bromopropane 0.56
    gamma-valerolactone 16.5
    n-decanol 0.54
    triethyl phosphate 1.15
    4-methyl-2-pentanol 0.25
    propionitrile 1.01
    vinylene carbonate 2.82
    1,1,2-trichlorotrifluoroethane 6.91
    DMS 3.01
    cumene 0.24
    2-octanol 0.46
    2-hexanone 2.04
    octyl acetate 1.37
    limonene 0.55
    1,2-dimethoxyethane 6.29
    ethyl orthosilicate 1.08
    tributyl phosphate 1.09
    diacetone alcohol 2.83
    N,N-dimethylaniline 1.12
    acrylonitrile 2.21
    aniline 1.23
    1,3-propanediol 1.01
    bromobenzene 0.71
    dibromomethane 0.84
    1,1,2,2-tetrachloroethane 3.16
    2-methyl-cyclohexyl acetate 1.64
    tetrabutyl urea 2.52
    diisobutyl methanol 0.48
    2-phenylethanol 1.84
    styrene 0.48
    dioctyl adipate 2.1
    dimethyl sulfate 3.84
    ethyl butyrate 1.59
    methyl lactate 2.26
    butyl lactate 2.27
    diethyl carbonate 1.14
    propanediol butyl ether 2.0
    triethyl orthoformate 1.75
    p-tert-butyltoluene 0.43
    methyl 4-tert-butylbenzoate 3.51
    morpholine 5.88
    tert-butylamine 0.2
    n-dodecanol 0.43
    dimethoxymethane 7.2
    ethylene carbonate 1.87
    cyrene 3.72
    2-ethoxyethyl acetate 4.31
    2-ethylhexyl acetate 1.4
    1,2,4-trichlorobenzene 1.44
    4-methylpyridine 3.44
    dibutyl ether 1.16
    2,6-dimethyl-4-heptanol 0.48
    DEF 3.87
    dimethyl isosorbide 8.64
    tetrachloroethylene 1.82
    eugenol 3.95
    triacetin 3.29
    span 80 3.21
    1,4-butanediol 0.3
    1,1-dichloroethane 0.78
    2-methyl-1-pentanol 0.43
    methyl formate 2.66
    2-methyl-1-butanol 0.42
    n-decane 0.07
    butyronitrile 0.8
    3,7-dimethyl-1-octanol 0.57
    1-chlorooctane 0.36
    1-chlorotetradecane 0.19
    n-nonane 0.05
    undecane 0.05
    tert-butylcyclohexane 0.02
    cyclooctane 0.02
    cyclopentanol 1.01
    tetrahydropyran 3.01
    tert-amyl methyl ether 0.81
    2,5,8-trioxanonane 8.15
    1-hexene 0.13
    2-isopropoxyethanol 1.39
    2,2,2-trifluoroethanol 0.66
    methyl butyrate 1.7

    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