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Chemical Reagents

Congo red (C.I. 22120) COA Report

CAS No.：573-58-0
Molecular weight：696.68
Aliases：Direct Red 28
Molecular formula：C₃₂H₂₂N₆Na₂O₆S₂
EC No.：209-358-4

Information

Specification category：

Product No.	Product name	specifications
1.28041.010	Congo red (C.I. 22120)	IND25g

Technical indicators：

Item	Ind
Transition range	0 Bluish violet~5.2Red
Insoluble matter in water	≤1.0%
Loss on drying	≤5.0%
Residue on ignition(as SO4)	≤27.0%

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Copper(II) sulfate?solution

Sodium hydrogen sulfate anhydrous

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Potassium carbonate anhydrous

Sodium bromate

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Nitric acid?56-57%

Antimony trichloride?

Dimethylammonium chloride

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Hydrazinium hydroxide?40%

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Fluoroboric acid

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Basic fuchsine (C.I.42510)

N,N-Diethyl-1,4-phenylenediammonium sulfate

Cetyltrimethylammonium bromide?

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Petroleum ether 30-60

1-Iodobutane?

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Ethylene glycol monoethyl ether?

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DL-Aspartic acid

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alpha-Cyclodextrin

1-Naphthol?

Tetraethylene pentamine

Chloroacetic acid

Calcium hydrogen phosphate?dihydrate

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Aluminum potassium sulfate?dodecahydrate

p-Toluenesulfonyl chloride?

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Ammonium benzoate

Sodium?formate anhydrous

Potassium fluosilicate?

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Potassium fluoborate?

Manganese(II) carbonate?

Ammonium hydrogen carbonate

Potassium chloride?

Octadecanoic acid

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tetra-Sodium diphosphate?decahydrate

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Diethanolamine

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Acid fuchsin

Pararosaniline chloride

Merthiolate sodium

Sodium malonate?

Copper(I) oxide

Ethylenediamine tetraacetic acid tetrasodium salt anhydros

Hydrazinium hydroxide?35%

Castor oil

Potassium carbonate crystal

Lead(Ⅱ) carbonate basic

Sodium salicylate

Aluminum powder?

Ethylenediammonium dichloride

Diisopropylamine?

Mannitol?

Diethyl oxalate

1,1,1-Trichloroethane?

Paraformaldehyde?

N-Chlorosuccinimide

Ethylene glycol?65%

Sodium 1-heptanesulfonate?

Silicone oil H201-350

Potassium stannate trihydrate

Sodium hydroxide?solution 25%

Magnesium acetate?tetrahydrate

Nitroethane?

Barium chloride?dihydrate

Indium granular

Tween 40

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Diethylene glycol monobutyl ether?

2-Thiobarbituric acid?

Florisil

Hydrazinium hydroxide 55%

Nickel(II) sulfate?hexahydrate

Martin medium modified

Kligler iron agar?

Nickel(II) carbonate basic tetrahydrate

Potassium thiocyanate?

Potassium bromide?

Formaldehyde solution?28%

Tin powder?

iso-Propanol?99.9%

Pepsin

Polyethylene glycol 600?

N,N-Dimethyl-1,4-phenylenediammonium dichloride

Potassium peroxodisulfate

Thioacetamide

Cobalt(III) oxide

Copper(II) oxide wire

Chlorobenzene?

Tetraethylammonium bromide?

Lead(Ⅱ) sulfate

Potassium iodate?

1-Dodecanethiol?

Magnesium sulfate anhydrous?

Manganese(II) acetate?tetrahydrate

Dimethyl sulfoxide

DL-Methionine

Ethylene glycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid

Polyethylene glycol 2000?

Dodecanoic acid；Lauric acid

Cerium(III) nitrate hexahydrate?

Sodium nitrite?

Benzyl chloride?

Nitrilotriacetic acid

Calcium carbonate?

Copper(II) sulfate?pentahydrate

Benzoyl hydrazine

Sodium thiosulfate standard volumetic solution

Sodium acetate?trihydrate

Polyethylene-polyamines

Ethylenediaminetetraacetic acid magnesium disodium salt

Nitromethane?

5% Benzalkonium bromide solution

Hydrazinium hydroxide 50%

1-Bromonaphthalene?

Bismuth citrate

Sodium benzenesulfinate

p-Toluidine?

Choline chloride

Sodium m-nitrobenzenesulfonate?

ethyl silicate

Phosphotungstic acid?

Sodium hydrogen phthalate?

Copper(II) sulfate anhydrous?

Strontium chloride?hexahydrate

Methylammonium chloride

Sodium nitroferricyanide?dihydrate

Trimethylchlorosilane?

Zinc phosphate?tetrahydrate

Triiodomethane?

Calcium nitrate?

Aluminum sheet?

Manganese(II) chloride tetrahydrate?

L-Histidine

Sodium hydrogen sulfite?

Sodium?perborate tetrahydrate

Potassium dichromate standard volumetic solution

Sodium sulfosalicylate?

Urea

Wright's stain

Chloramine T trihydrate

Silver nitrate?

Soda lime

Nickel(II) sulfamate solution

Phosphorus(V) oxide

Bromine

Polyvidone 25

Aluminum chloride anhydrous?

Lead(Ⅱ) acetate trihydrate

Sodium 1-hexanesulfonate?

N,N-Dimethylacetamide

Potassium tetraoxalate dihydrate

Acetonitrile

Ammonium phosphate?

Peroxyacetic acid

Hydrazinium hydroxide?80%

Polyvinyl alcohol ammonium phosphate?

Safranine T (C.I.50240)

Agar?powder

3,3'-Dimethyldiphenylamine

Ammonium metavanadate?

Indole-3-acetic acid?

Sodium cobaltinitrite?

n-Octanol

D-Mannose

Amberlite 717

Calcon carboxylic acid

Ammonium persulfate?

Ethylenediamine tetraacetic acid dipotassium?salt hexadrate

Iron(III) chloride?hexahydrate

Lead(Ⅱ) carbonate

Cellulase Onozuka R-10

Tetramethylammonium hydroxide

m-Chloroaniline

Peptone

Lithium acetate?dihydrate

D-Xylose?

Potassium sodium citrate monohydrate

o-Cresolphtalein complexon

p-Nitrotoluene?

6-Amino caproic acid

Lactic acid?

Hydrogen peroxide 50%

Copper(I) iodide?

Dimethyl yellow (C.I.11020)

Magnesium citrate tetradecahydrate

Polyethylene glycol 20000?

Sodium tripolyphosphate / Sodium triphosphate

Ammonium molybdate?tetrahydrate

Diisopropyl ether?

Tin(II) chloride?dihydrate

3-Nitrophenol?

1,2-Dibromoethane?

N-Methylmorpholine

Hydrochloric acid?18%

Tween 80

Sodium succinate?hexahydrate

Ethylenediamine tetraacetic acid tetrasodium solution

Formaldehyde solution?30%

Thiosemicarbazide

Eosin Y (alcohol soluble)? (C.I.45380.2)

1,4-Butanediol

Aluminum?chloride basic solution 50%

Titanium trichloride solution

Gulaiacol

Potassium hydrogen tartrate

Nigrosine ( spirit soluble)

Methyl blue (C.I.42780)

Ethylenediamine tetraacetic acid disodium salt standard volumetic solution

Benzoyl chloride?

Gum arabic?

Disodium hydrogen phosphate anhydrous?

Anthrone?

Cadmium sulfate?octahydrate

Iron(II) sulfate?heptahydrate

Ethylene glycol dimethyl ether?

Polyethylene glycol 200

Histamine

n-Butanol?

Hydrochloric acid?

Ponceau S (C.I. 27195)

Barium carbonate?

Riboflavine

Sodium dodecylsulfate?

Inositol?

Petroleum ether 90-120

tert-Butyl methyl ether

Diphenyl ether

Sodium D-gluconate

1,2,3,4-Tetrahydronaphthalene?

Phosphorus red?

Iron standard solution for impurity

Sodium acetate anhydrous?

Ammonium thiocyanate?

Zinc standard solution for impurity

Salicylic acid?

Cresol red

Bovine albumin

Ethylenediamine tetraacetic acid disodium salt

Indigo carmine (C.I. 73015)

Potassium hydroxide?48%

tri-Potassium phosphate?trihydrate

Silver diethyldithiocarbamate

Copper foil?

Cerium(IV) oxide?

Alikali blue 6B (C.I.46725)

L-Cysteine hydrochloride anhydrous

Barium chromate?

L-Histidine hydrochloride

Sodium tetraphenyl boron?

Span 80

Sulfamic acid

Xylenol orange

Hydrochloric acid 33%

Chloroform

Trifluoroacetic acid?

Hematoxylin

Polyphosphoric acid

Methyl 4-hydroxybenzoate

Titan yellow (C.I.19540)

Cobalt(II) sulfate?heptahydrate

1,10-Phenanthroline

Acetamide

Sodium hexametaphosphate

Butyric acid?

Sodium hydroxide?solution 50%

Span 20

Potassium dichromate

D-Fructose?

Methyl violet?(C.I.42535) Crystal Violet

Zirconium hydroxide?

Hydrogen peroxide 35%

Ammonium bromide

Peroxyacetic acid

Dimethyl o-phthalate?

Bromoethane?

Nickel ammonium sulfate hexahydrate

Sodium stannate?trihydrate

Sodium thiocyanate?

4-(Dimethylamino)benzaldehyde

Tetrabutyl titanate?

Propyl 4-hydroxybenzoate?

Hydrochloric acid?20%

1,2-Propanediol

0.5% Dextrose broth?

Chromotropic acid disodium salt

Rhodamine B

Hexamethyldisilazane

Trisodium citrate?dihydrate

Triethylamine

Manganese(II) sulfate?monohydrate

Tetrahydrofurfuryl alcohol?

Benzenesulfonyl chloride?

Lead standard solution for impurity

Peroxyacetic acid

Sodium fluoride

Potassium iodate standard volumetic solution

Sodium dihydrogen phosphate anhydrous?

Silicon dioxide?

Tween 20

Methylthymol blue

Potassium phosphate tribasic anhdrous

Sulfuric acid?standard solution 0.1%

Zinc chloride

Potassium hydrogen oxalate

Methyl acetate?

Peptone, fish powder

Ammonium sulfamate?

Magnesium nitrate?hexahydrate

Lead(Ⅱ) chloride

Formaldehyde solution?22.8%

?Amido black 10B

Trypan blue

2,6-Di-tert-butyl-4-methylphenol

Iodine?

5-(4-Dimethylaminobenzylidene)-rhodanine

Thiourea

Na-Benzoyl-L-arginine ethyl ester hydrochloride

1-Bromobutane?

5-Sulfosalicylic acid dihydrate

1,2-Dichlomoethane?

Calcium chloride anhydrous?

Phenol

Hexamethylenetetramine

Barium peroxide

Methylamine alcohol solution?

Polyvinyl alcohol

Orange G

Copper(II) formate hydrate

1-Naphthylamine

Lead(Ⅱ,Ⅳ) oxide red

tri-Potassium citrate monohydrate

Calcium chloride dihydrate?

Lactose bile fermentation medium

Zinc acetate dihydrate

Fumaric acid

Dimethylamine water solution

Phthalic anhydride?

Sodium chromate(VI) anhydrous

Potassium hydrogen carbonate

8-Hydroxyquinoline

Borax buffer solution

Maleic acid

Barium stearate?

Sodium benzoate?

Ethylenedinitrilotetraacetic acid

Sodium carbonate anhydrous?

Semicarbazide hydrochloride

Sodium?hexametaphosphate

Iron(II) chloride tetrahydrate

4,4'-Diaminodiphenyl sulphone

Citric acid?monohydrate

N,N'-Methylene bisacrylamide

Potassium hydroxide

Hydrochloric acid?32%

Span 60

Bismuth(III) chloride?

Naphthalene?

Bismarck brown Y (C.I.21000)

Sodium ethylate

Tris(hydroxymethyl) aminomethane?

Copper powder?

Sodium nitrate?

Nitroblue tetrazolium chloride

n-Propanol?

Trypsin

Diisobutylamine

Disodium rhodizonate?

Indigo carmine (C.I.73015)

Manganese powder?

Acetylacetone

D-Phenylalanine

Ethylenediamine tetraacetic acid tetrasodium salt dihydrate

Sodium?hypophosphite monohydrate

Ethylene glycol monobutyl ether?

1-Dodecanol?

Ammonium pyrrolidine dithiocarbamate

Ethylenediamine tetraacetic acid dipotassium?salt dihydrate

Sodium iodate

1,4-Benzoquinone?

Boron trifluoride etherate

Calcein indicator

Acid chrome blue K (C.I.16675)

3,5-dihydroxytoluene

Selenium dioxide?

Ammonium iodide?

Sodium iodide?dihydrate

Ethanol 70%

1-Methyl-2-pyrrolidone?

Methyl red indicator solution for use in test methods

Sudan I (C.I.12055)

Lithium standard solution for impurity

Sulfur sublimed

Starch soluble

Guanidine carbonate

2,4,6 - Triamino-1,3,5-triazine

Petroleum ether 60-90

Ethanol 75%

Sodium hydrogen tartrate?

Silica gel

Potassium sulfate?

Iodoethane?

Sodium sulfate anhydrous?

Ammonium iron(II) sulfate?hexahydrate

Nicotinamide adenine dinucleotide free acid

Trimethylol propane

Sodium sulfide nonahydrate

Polyethylene glycol 8000

Sodium carboxymethyl cellulose?

Germanium oxide

Yeast extract?

D(+)-Galactose

2-Chlorobenzoic acid?

Trichloroacetic acid?

SodiuM cholate hydrate

Lead(Ⅱ) acetate basic

Potassium oxalate?monohydrate

OP emulsifying agent

Sodium hydroxide?solution 30%

Gentian violet??(C.I.42535 or 42555)

Malachite green?(C.I.42000）

Iron(III) nitrate?nonahydrate

Iodine?

Sodium diphenylamine-4-sulfonate?

Rose bengal sodium salt (C.I. 45440)

Casein

Aluminum hydroxide?

Isobuty methyl ketone

Barium acetate?

Sodium chlorate?

Hydrochloric acid 35%

Bis(cyclohexanone)- oxalyldihydrazone

Potassium fluoride dihydrate

Quartz sand?

Sodium ferrocyanide?

Tetrabutylammonium iodide?

Calcium hydroxide?

Ethanol 75%

α-Naphthylacetic acid?

Hydroquinone

Benzidine dihydrochloride

Ammonium tartrate?

Silicone oil H201-500

Benzoic acid?

Phosphorus acid

Iron standard solution for impurity

Aluminum?chloride crystal

Calcium stearate?

1H-Benzotriazole

di-Magnesium trisilicate

Ammonium aluminum sulfate?dodecahydrate

Bromothymol blue

Magnesium carbonate basic?pentahydrate

Chromium(III) sulfate solution 50%

Bromocresol green solution 0.4%

Indole-3-butyric acid

Copper(II) hydroxide?

Gold chloride / Chloroauric acid hydrated

Aluminum nitrate nonahydrate

?2-hydroxy-3,5-dinitro-Benzoic acid

Diethyl ether?

Periodic acid?

Potassium hydroxide?45%

Diethylene glycol monomethyl ether?

Peptone

Diacetyl monoxime

Sodium dodecylsulfonate?

N,N-Dimethylbenzylamine

DL-Alanine

Ammonium cerium(IV) sulfate?

Magnesium chloride?hexahydrate

Silicotungstic acid?

Sodium sulfate decahydrate

Zinc granular

trans-Cinnamaldehyde?

Kaolin?

Ammonium carbonate

Asbestos soda

Iodine standard volumetic solution

Iron(III) citrate?pentahydrate

Polyethylene glycol 10000?

Copper standard solution for impurity

Ammonium hydrogen difluoride?

Chromium powder?

Glycerol?

tert-Butylamine?

Sodium tungstate?dihydrate

Nickel(II) chloride?hexahydrate

Ethanol absolute 99.98%

Diacetone alcohol?

1,1,2,2-Tetrachloroethane?

Pyridine

Stannous methanesulfonate

Cinchonine

Copper(II) nitrate?trihydrate

Barium hydroxide?octahydrate

β- Cyclodextrin

Ammonium acetate?

Zinc nitrate?hexahydrate

N,N'-Methylene bisacrylamide

iso-Butanol?

Hydroxylamine sulfate

Polyethylene glycol 6000?

Lead(Ⅱ) oxide yellow

Cyclohexanol

Sodium carboxymethyl cellulose 300-800?

4,4'-Diaminodiphenylmethane?

Alizarin complexone

Sodium dodecylbenzenesulfonate?

Sodium diethyldithiocarbamate trihydrate

Selenite Cystine broth?

Zinc dihydrogen phosphate?

Zinc sulfate?heptahydrate

Carbon tetrachloride?

Bromocresol green

Aluminum sulfate?octadecahydrate

Lanthanum chloride?heptahydrate

Barium nitrate?

Lead powder

D-Sorbitol?

N,N-Dimethylformamide?

Sodium 1-pentanesulfonate?

Potassium acetate

Potassium hydrogen phthalate

iso-Octane?

Potassium chromate indicator solution.

Benzaldehyde?

Sodium fluoroaluminate?

Sodium hydrogen carbonate?

n-Octane?

Benzyl alcohol?

2-Mercaptobenzothiazole

Lithium carbonate?

Aluminum oxide neutral?200-300

Ethylamine water solution

Lead(II) nitrate standard volumetic solution

Bromocresol purple

Cobalt(II) nitrate?hexahydrate

Copper(II) chloride dihydrate

Sudan III (C.I.26100)

Sodium hydroxide standard volumetic solution

Calcium dihydrogen phosphate?

DL-Malic acid

Antipyrine

Potassium hexachloroplatinate(Ⅳ)

Tween 60

N-Bromosuccinimide

2,4-Dinitrophenylhydrazine

Sodium carboxymethyl cellulose?800-1200

di-Potassium hydrogen phosphate trihydrate

Disodium hydrogen phosphate?dodecahydrate

sec-octyl alcohol

Ethylene glycol phenyl ether?

Metol?

Barium oxide?anhydrous

Copper(II) oxalate hemihydrate

Copper(II) acetate?monohydrate

Potassium bromate?

Histamine phosphate

Phenol red solution 0.02%（AR)

Sodium dihydrogen phosphate monohydrate

Potassium chlorate

1,5-Diphenylcarbazide

Ethanol 73%～75%

Methyl salicylate

Lithium chloride?monohydrate

Selenium powder?

Potassium tartrate hemihydrate

Sodium thiosulfate?pentahydrate

Neutral red (C.I.50040)

Sodium hypochlorite?

Thioglycollate medium?

Cupferron

Cobalt(II) acetate?tetrahydrate

Methylene blue (C.I.52015)

Ethanolamine 10%

Citric acid

Eosin Y (water soluble) (C.I.45380)

Sodium perchlorate?monohydrate

Charcoal activated powder

Tin granular?

Aluminum oxide neutral?

N-Phenylanthranilic acid

1-Amino-2-naphthol-4-sulfonic acid?

Guanidinium chloride

Hydrobromic acid?

Sodium hydroxide?solution 40%

Bismuth subnitrate?

Lanthanum nitrate?hexahydrate

Sodium dihydrogen phosphate?dihydrate

Hydrochloric acid standard volumetic solution

Itaconic acid?

Carmine

Tin(IV) chloride pentahydrate

Nickel(III) oxide?

1,4-Phenylenediammonium dichloride

L-Cystine

Triphenylphosphine?

Sodium chromate tetrahydrate

Aniline blue (water soluble) (C.I.42755)

Vanillin

Chrome azurol S (C.I.43825)

Methylamine water solution?

Potassium pyrosulfate

Folic acid?

Iodine monochloride?

Magnesium sulfate?heptahydrate

Polyethylene glycol 4000?

Sulfuric acid standard volumetic solution

2-Butanol

Glycerol monostearate

Potassium permangaNot availablete standard volumetic solution

p-Toluene sulfonamide

Chromium(III) nitrate?nonahydrate

Polyethylene glycol 1450

Lithium hydroxide?monohydrate

Hydrochloric acid?31%

Bismuth(III) oxide?

Formaldehyde solution?

Copper(II) carbonate basic

2,3,5-Triphenyl tetrazolium chloride

Trisodium phosphate?dodecahydrate

Bile salt pig

Sodium sulfite anhydrous?

Polyethylene glycol 400?

Chromium(III) sulfate hexahydrate

Cedar?wood oil

Potassium dihydrogen phosphate

1-Bromopropane?

iso-Butyl acetate?

2-Butyne-1,4-diol

Nigrosine (water soluble)

Murexide

Cinnamic acid

Congo red (C.I. 22120)

Potassium pyrophosphate trihydrate

Paraffin liquid?

Potassium oleate

Aluminum acetylacetonate

4-Hydroxybenzaldehyde?

Hydroxylammonium chloride

iso-Propanol?

Glycylglycine

Eriochrome black T (C.I.14645)

Ethyl 4-hydroxybenzoate

1,2-Propanediol?

Potassium?perchlorate

Bromocresol green sodium salt

Mandelic acid

Crystal violet?(C.I.42555)

Phosphomolybdic acid?

Ammonium dihydrogen phosphate?

Nickel(II) nitrate hexahydrate

Ethylene glycol monomethyl ether?

Diethylene glycol monoethyl ether?

Potassium standard solution for impurity

Sodium potassium tartrate?tetrahydrate

Diethyl ether?anhydrous

Iron(III) oxide?

Silicic acid?

Potassium thiosulfate hydrate

Acrylic acid?

Polyethylene glycol 1000?

Potassium metabisulfite

Sodium hydroxide?solution 49%

Oxalic acid?

Phosphorous acid?

Chromium(Ⅲ) potassium sulfate dodecahydrate

2,4-Dinitrophenol

Potassium stannate

Sodium fluorosilicate?

1,3,5-Trimethylbenzene?

Polyethylene glycol 300?

Iron(III) sulfate

1,2-Phenylenediamine

Diboron trioxide?

Sodium dichromate?dihydrate

Palladium(II) chloride anhydrous

Ethylenediamine tetraacetic acid standard solution

D-Glucose?monohydrate

Diammonium hydrogen citrate?

Methyl red sodium salt

Methane sulfonic acid

Potassium antimony tartrate

Chloral hydrate

Ammonium cerium(IV) nitrate

Sodium standard solution for impurity

Benzophenone

Hydrogen peroxide 30%

Amberlite 732

Thiamine chloride hydrochloride

Sodium silicate?nonahydrate

Charcoal activated granular

Zirconium oxychloride?octahydrate

Ethylenediaminetetraacetic acid ferric monosodium salt

Fluosilicic acid?23%-25%

Sodium hydroxide?solution 32%

p-Xylene?

Benzidine

Ammonium iron(III) sulfate?dodecahydrate

Magnesium turnings

Sodium hydrogen fluoride

Potassium permanganate

Zirconium nitrate

Magnesium ribbon?99.5%

2-Nitrophenol?

Cerium(IV) sulfate?tetrahydrate

Dicyclohexyl phthalate

Alizarin yellow R (C.I.14030)

1-Cyanoguanidine

Sodium tetraborate?decahydrate

Manganese nitrate?solution 50%

1-(2-Pyridylazo)-2-naphthol?

Calcium fluoride?

4-Aminoantipyrine

Butyl methacrylate

4-Chlorophenoxy acetic acid

Ammonium cerium(IV) sulfate standard volumetic solution

Potassium hydrogen sulfate?

Sodium tartrate?dihydrate

Benzenemethanaminium

Nitric acid 40%

Sodium metaborate hydrate

4-Nitrobenzoic acid?

Acrylamide

Sodium 1-octanesulfonate?

Benzene?

Cyclohexylamine

Orange II

Silicone oil H201-100

D-Glucose?

Zinc free from arsenic?

Dimethylglyoxime

Triethylenetetramine

Lithium sulfate?monohydrate

?Pyrogallol acid

Magnesium ribbon

Sodium heparin

Phenol red sodium salt

Potassium hexacyanoferrate(Ⅱ) trihydrate

Sodium ammonium hydrogen phosphate?

Phenolphthalein

Methyl red (C.I. 13020)

Triethylene glycol?

Triethyl phosphate?

Salicylamide

Diammonium hydrogen phosphate?

Potassium hexacyanoferrate(Ⅲ)

Nickel(II) acetate?

Nitroso R salt

di-Potassium hydrogen phosphate anhydrous

1,4-Dioxane?

Lymphocyte separation media?

Fluorescein?sodium

Manganese standard solution for impurity

Triethyl orthoformate

Sodium barbital?

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