C.I. Acid Red 18, trisodium salt

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  • Identifiers

    CAS number
    2611-82-7

    Molecular formula
    C20H11N2Na3O10S3

    SMILES
    C1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)[O-])N=NC3=C(C=CC4=CC(=CC(=C43)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+].[Na+].[Na+]

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  • Odor profile

    Fragrance
    Odorless 83.98%
    Cooked 20.77%
    Savory 18.24%
    Bitter 17.34%
    Burnt 16.35%
    Roasted 13.84%
    Clean 13.11%
    Pungent 12.85%
    Milky 11.07%
    Grape 10.98%

     

    Flavor
    Bitter 90.65%
    Odorless 32.46%
    Bland 20.14%
    Nitrile 19.63%
    Very strong 17.61%
    Taco 17.46%
    Bread crust 17.38%
    Indole 17.33%
    Roasted peanuts 16.99%
    Rotten 16.94%

     

    Odor impact est.
    Odorless

  • Properties

    pKa est.
    2.06 (strong acid)

    Molecular weight
    604.5 g/mol

    Flash point

    • 425.68 ˚C est.

  • Synonyms

    • C.I. Acid Red 18, Trisodium Salt
    • DTXSID9021213
    • RefChem:1080550
    • DTXCID501507484
    • Ponceau 4R
    • 2611-82-7
    • New coccine
    • Acid red 18
    • C.I. Acid Red 18
    • Food Red No. 102
    • Victoria Scarlet 3R
    • SX Purple
    • Coccine
    • Food Red 7
    • Acid Brilliant Scarlet 3R
    • Brilliant Scarlet 4R
    • Cochineal Red A
    • Food Red 102
    • C.I. Acid Red 28
    • Neucoccin
    • Brilliant Ponceau 3R
    • Brilliant Scarlet 3R
    • Naphthalene Ink Scarlet 4R
    • Strawberry Red
    • Coccin Red
    • New Coccin
    • Purple Red
    • Brilliant Scarlet
    • Atul Scarlet F
    • Acid Ponceau 4R
    • Acid Scarlet 3R
    • Acid Scarlet 4R
    • Java Scarlet 3R
    • Neklacid Red 3R
    • Neklacid Red 4R
    • Scarlet 4R
    • Ponceau 4RE
    • Ponceau 4RF
    • Ponceau 4RT
    • Scarlet 4RA
    • Cochineal Red 4R
    • Kiton Scarlet 4R
    • Acid Scarlet 3RZ
    • Cilefa Ponceau 4R
    • Fenazo Scarlet 3R
    • HD Ponceau 4R
    • Ponceau 4RE.FQ
    • Colacid Ponceau 4R
    • Hexacol Ponceau 4R
    • Pontacyl Scarlet RR
    • Acilan Scarlet V3R
    • Victoria Scarlet Red
    • Brilliant Ponceau 4R
    • Brilliant Ponceau 5R
    • Ponceau 4RC
    • Certicol Ponceau 4RS
    • Curol Bright Red 4R
    • C.I. 16255
    • Atul Acid Scarlet 3R
    • Brilliant Ponceau 3RF
    • Brilliant Ponceau 4RC
    • HD Ponceau 4R Supra
    • Naphthalene Scarlet 4R
    • C.I. Food Red 7
    • Strawberry Red A Geigy
    • Naphthalene Scarlet 4RS
    • L-Red 4
    • Edicol Supra Ponceau 4R
    • Eurocert Cochineal Red A
    • Hidacid Fast Scarlet 3R
    • CI 16255
    • Acidal Bright Ponceau 3R
    • Kochineal Red A for Food
    • New Coccine Extra Pure A
    • Edicol Supra Ponceaux 4RS
    • Sugai Brilliant Scarlet 3R
    • Edicol Supra Ponceaux 4 RS
    • Rakuto Brilliant Scarlet 3R
    • Aizen Brilliant Scarlet 3RH
    • San-ei Brilliant Scarlet 3R
    • Bucacid Brilliant Scarlet 3R
    • Takaoka Brilliant Scarlet 3R
    • 1578 Red
    • Daishiki Brilliant Scarlet 3R
    • Acid Red 18;New Coccine
    • Calcocid Brilliant Scarlet 3RN
    • Cochineal Red A Specially Pure
    • Hispacid Brilliant Scarlet 3RF
    • Z525CBK9PG
    • Kayaku Acid Brilliant Scarlet 3R
    • Kayaku Food Colour Red No. 102
    • New Coccine Extra Conc. A Export
    • Symulon Acid Brilliant Scarlet 3R
    • 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, trisodium salt
    • 51811-48-4
    • Brilliant Ponceau 4RC Specially Pure
    • Brilliant Scarlet 3R (Biological stain)
    • MFCD00004084
    • 1,3-Naphthalenedisulfonic acid,7-hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-, trisodium salt
    • Sodium 7-hydroxy-8-((4-sulfonatonaphthalen-1-yl)diazenyl)naphthalene-1,3-disulfonate
    • E 124
    • Zolfosol
    • Ponceau 4RC(E124)
    • Crimson SX
    • Purple SX
    • Neucoccin [German]
    • L-Rot 4 [German]
    • Food Red Number 102
    • Cochenillerot A
    • Coccine nouvelle
    • Red Dye No. 102
    • Cochenillerot A [German]
    • Food Red No. 102 (>80%)
    • Coccine nouvelle [French]
    • Edicol Supra Ponceau 4RS
    • GW 306684A
    • Trisodium 7-hydroxy-8-(4-sulfonatonaphthalen-1-yl)diazenylnaphthalene-1,3-disulfonate
    • C20H11N2Na3O10S3
    • Cerven kysela 18 [Czech]
    • Cerven kosenilova A [Czech]
    • Cerven kysela 18
    • 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-(2-(4-sulfo-1-naphthalenyl)diazenyl)-, sodium salt (1:3)
    • New Coccine Red No. 102
    • Cerven kosenilova A
    • Schultz Nr. 213 [German]
    • NSC-4301
    • CCRIS 2652
    • 2611-82-7

  • Applications

    C.I. Acid Red 18, trisodium salt (CAS 2611-82-7) is a water-soluble azo dye used primarily in textile and leather applications, notably for protein fibers such as wool and silk in acid dyeing baths and for polyamides (nylon); it also functions as a colorant in coatings and printing inks for industrial formulations and serves as a dye intermediate in the synthesis of other azo dyes, with potential use for coloring certain polymers and plastics where compatible substrate chemistry exists.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 2.02
    methanol 3.46
    isopropanol 0.99
    water 0.05
    ethyl acetate 1.45
    n-propanol 1.33
    acetone 5.92
    n-butanol 0.63
    acetonitrile 2.28
    DMF 75.44
    toluene 0.47
    isobutanol 0.55
    1,4-dioxane 9.0
    methyl acetate 4.05
    THF 15.3
    2-butanone 5.07
    n-pentanol 0.43
    sec-butanol 0.82
    n-hexane 0.01
    ethylene glycol 4.25
    NMP 39.01
    cyclohexane 0.03
    DMSO 17.42
    n-butyl acetate 1.49
    n-octanol 0.99
    chloroform 0.53
    n-propyl acetate 1.44
    acetic acid 4.7
    dichloromethane 0.77
    cyclohexanone 4.94
    propylene glycol 3.81
    isopropyl acetate 1.02
    DMAc 49.67
    2-ethoxyethanol 6.05
    isopentanol 0.36
    n-heptane 0.03
    ethyl formate 1.97
    1,2-dichloroethane 0.67
    n-hexanol 0.42
    2-methoxyethanol 19.28
    isobutyl acetate 0.51
    tetrachloromethane 0.04
    n-pentyl acetate 2.22
    transcutol 14.55
    n-heptanol 0.77
    ethylbenzene 0.13
    MIBK 0.87
    2-propoxyethanol 8.04
    tert-butanol 0.68
    MTBE 0.59
    2-butoxyethanol 5.63
    propionic acid 3.37
    o-xylene 0.27
    formic acid 7.24
    diethyl ether 0.96
    m-xylene 0.23
    p-xylene 0.17
    chlorobenzene 0.28
    dimethyl carbonate 4.74
    n-octane 0.03
    formamide 13.44
    cyclopentanone 12.37
    2-pentanone 2.25
    anisole 0.88
    cyclopentyl methyl ether 1.65
    gamma-butyrolactone 14.18
    1-methoxy-2-propanol 11.46
    pyridine 7.09
    3-pentanone 2.05
    furfural 12.38
    n-dodecane 0.03
    diethylene glycol 9.14
    diisopropyl ether 0.14
    tert-amyl alcohol 0.62
    acetylacetone 4.96
    n-hexadecane 0.04
    acetophenone 1.47
    methyl propionate 3.29
    isopentyl acetate 0.85
    trichloroethylene 1.6
    n-nonanol 1.06
    cyclohexanol 0.56
    benzyl alcohol 1.15
    2-ethylhexanol 0.25
    isooctanol 0.48
    dipropyl ether 0.98
    1,2-dichlorobenzene 0.22
    ethyl lactate 2.13
    propylene carbonate 2.82
    n-methylformamide 16.67
    2-pentanol 0.35
    n-pentane 0.02
    1-propoxy-2-propanol 5.67
    1-methoxy-2-propyl acetate 3.76
    2-(2-methoxypropoxy) propanol 5.4
    mesitylene 0.11
    ε-caprolactone 4.42
    p-cymene 0.18
    epichlorohydrin 7.91
    1,1,1-trichloroethane 0.17
    2-aminoethanol 3.82
    morpholine-4-carbaldehyde 42.87
    sulfolane 16.51
    2,2,4-trimethylpentane 0.01
    2-methyltetrahydrofuran 2.74
    n-hexyl acetate 2.19
    isooctane 0.0
    2-(2-butoxyethoxy)ethanol 8.07
    sec-butyl acetate 0.59
    tert-butyl acetate 1.09
    decalin 0.01
    glycerin 12.78
    diglyme 14.18
    acrylic acid 6.0
    isopropyl myristate 0.9
    n-butyric acid 1.59
    acetyl acetate 1.07
    di(2-ethylhexyl) phthalate 1.04
    ethyl propionate 1.14
    nitromethane 15.52
    1,2-diethoxyethane 3.12
    benzonitrile 1.32
    trioctyl phosphate 0.83
    1-bromopropane 0.2
    gamma-valerolactone 32.44
    n-decanol 0.76
    triethyl phosphate 0.59
    4-methyl-2-pentanol 0.15
    propionitrile 1.64
    vinylene carbonate 3.31
    1,1,2-trichlorotrifluoroethane 9.74
    DMS 2.94
    cumene 0.07
    2-octanol 0.59
    2-hexanone 1.45
    octyl acetate 1.44
    limonene 0.24
    1,2-dimethoxyethane 9.81
    ethyl orthosilicate 0.5
    tributyl phosphate 0.77
    diacetone alcohol 3.18
    N,N-dimethylaniline 0.7
    acrylonitrile 4.42
    aniline 1.11
    1,3-propanediol 3.58
    bromobenzene 0.18
    dibromomethane 0.29
    1,1,2,2-tetrachloroethane 1.25
    2-methyl-cyclohexyl acetate 0.8
    tetrabutyl urea 2.27
    diisobutyl methanol 0.18
    2-phenylethanol 1.18
    styrene 0.18
    dioctyl adipate 1.61
    dimethyl sulfate 7.14
    ethyl butyrate 1.14
    methyl lactate 6.59
    butyl lactate 3.01
    diethyl carbonate 0.74
    propanediol butyl ether 6.42
    triethyl orthoformate 1.14
    p-tert-butyltoluene 0.18
    methyl 4-tert-butylbenzoate 2.85
    morpholine 11.08
    tert-butylamine 0.21
    n-dodecanol 0.54
    dimethoxymethane 19.42
    ethylene carbonate 2.17
    cyrene 6.45
    2-ethoxyethyl acetate 5.43
    2-ethylhexyl acetate 0.64
    1,2,4-trichlorobenzene 0.47
    4-methylpyridine 3.06
    dibutyl ether 0.85
    2,6-dimethyl-4-heptanol 0.18
    DEF 5.31
    dimethyl isosorbide 8.72
    tetrachloroethylene 0.74
    eugenol 4.03
    triacetin 4.04
    span 80 4.5
    1,4-butanediol 1.3
    1,1-dichloroethane 0.33
    2-methyl-1-pentanol 0.25
    methyl formate 12.4
    2-methyl-1-butanol 0.43
    n-decane 0.06
    butyronitrile 0.81
    3,7-dimethyl-1-octanol 0.45
    1-chlorooctane 0.26
    1-chlorotetradecane 0.12
    n-nonane 0.04
    undecane 0.04
    tert-butylcyclohexane 0.01
    cyclooctane 0.01
    cyclopentanol 1.39
    tetrahydropyran 2.26
    tert-amyl methyl ether 0.56
    2,5,8-trioxanonane 10.47
    1-hexene 0.05
    2-isopropoxyethanol 2.82
    2,2,2-trifluoroethanol 2.33
    methyl butyrate 1.55

    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