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We offer a complete product range of Azure II Eosinate, Phenolphthalein Complexone, Pyrogallol Red, P-Xylenol Blue and Cresol Red ACS Grade

Azure II Eosinate

  • C.A.S. No. 53092-85-6
  • Solubility 0.1% (MeOH) Clear solution
  • Absorption maximum (MeOH) ?1max 647-652nm
  • Absorption maximum (MeOH) ?2 max 520-525nm
  • Absorptivity (A1%/1cm in MeOH,at ?1max on dried substance) >1250
  • Absorptivity (A1%/1cm in MeOH,at ?2max on dried substance) 400
  • Loss On Drying (110°C) <10%
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Phenolphthalein Complexone

  • C.A.S. No. 25296-54-2
  • M.W. 608.56gm/mole
  • Appearance Off white powder
  • Solubility Clear solution
  • Absorption Maximum(in 0.1N NaOH) ?max 556-560nm
  • Absorptivity (A1%/1cm, in 0.1N NaOH at ?max) >300
  • Loss on drying (110°C) <5%
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Pyrogallol Red

  • C.A.S. No. 32638-88-3
  • M.F. C19H14O9S
  • M.W. 418.39gm/mole
  • Solubility 0.1% (0.1n Naoh) Clear Solution
  • Absorption maximum (in acidic MeOH) ?max 474-478nm
  • Absorptivity 1%, 1cm (in acidic MeOH) at ?max >450
  • Loss on drying (110°C) <5%
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P-Xylenol Blue

  • C.A.S. No. 125-31-5
  • M.F. C23H22O5S
  • M.W. 410.49gm/mole
  • Dye Content (by Spectrophotometry) >90%
  • Solubility 0.1 % (MeOH) Clear solution
  • Transition range pH 8.0-9.6 Yellow-Blue
  • Absorption maximum (in MeOH) ?max 424+/-5nm
  • Absorptivity (A1%/1cm, in MeOH) >200
  • Loss on drying (110°C) <3%

Chemical Name

4, 4'-(3H-2, 1-Benzoxathiol-3-ylidene)bis(2, 5-dimethylphenol) S, S-dioxide

 

InChI Key

MGUKYHHAGPFJMC-UHFFFAOYSA-N

 

Solubility

Soluble in acetone, alcohol, and dilute aqueous alkali. Sparingly soluble in water.

 

Xylenol Blue is a dark brown powder and it belongs to the class of sulfonephthalein dyes. Xylenol Blue changes color from red (pH 1.2) to yellow (2.8) and yellow (8.0) to blue (9.6). It is widely used in food storage, drugs, determining bacterial growth, microbial assays and determining lipase.

 

Applications:

Xylenol Blue is a useful alternative to thymol blue developed in the 1920s. Xylenol Blue can be used at half the concentration that thymol blue requires. It is functional at the same two pH ranges, acidic (pH 1-3), which transitions from red to yellow, and basic (pH 8-10), which transitions from yellow to blue. Used in electrochromic displays, chemical sensors, fiber-optic pH sensors, optical quality films, ink, corrosion testing, lubricants, TTI indicators, food storage, cosmetics, bacterial growth, microbiological assays, determining lipase, drugs.

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Cresol Red ACS Grade

  • C.A.S. No. 1733-12-6
  • M.F. C21H18O5S
  • M.W. 382.43gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Transition Range pH 6.5-8.8 Yellow-Purple
  • Solubility 0.1% (95% EtOH) Clear solution
  • Absorption maximum (pH 6.5) ?1max 432-436nm
  • Absorption maximum (pH 8.8) ?2max 571-574nm
  • Absorptivity (A1%/1cm at pH 6.5 at ?1max) 490-540
  • Absorptivity (A1%/1cm at pH 8.8 at ?2max) 1000-1100
  • Loss On Drying (110°C) < 3%
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Methylthymol Blue Complexone

  • C.A.S. No. 1945-77-3
  • M.F. C37H40N2Na4O13S
  • M.W. 844.76gm/mole
  • Solubility 0.1 % (Dist. water) Clear solution
  • Absorption maximum (Dist. water) ?max 437-443nm
  • Absorptivity maximum (A1%/1cm, in water, at ?max) >120
  • Loss On Drying (110°C) <10%
  • Suitability as indicator for Metal Titration Passes test

Chemical Name

3, 3-Bis(N, N-Di(Carboxymethyl)Aminomethyl)Thymolsulfonephthalein, Sodium Salt

 

InChI Key

KIHCHVIVBXSLBU-UHFFFAOYSA-N

 

Solubility

Water soluble (10 g/l, H2O, 25 °C). Soluble in Methanol

 

Methylthymol blue is a Water soluble chelometric indicator.Methylthymol blue (MTB) is a metal- lochromic indicator which forms metal complexes different in spectral absorption characteristics from the free indicator. The barium complex is formed at relatively high pH with maximum absorption at 608 nm; free MTB at the same pH has a maximum absorption at 460nm.

 

Applications:

Methylthymol Blue sodium salt is used as thymol-containing organic dye for complexometric titration for Strontium. Methylthymol Blue sodium salt is mainly used for determining the calcium content in biological samples. It is used in determination of sulfate in rainwater. It combines with silica gel and aids in the separation and preconcentration of trace amounts of heavy metals from some salts. It is used in automated method applicable for qualitative analysis of presence of alkali metals to groundwater, drinking and surface waters, and domestic and industrial wastes.

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Calcon Carboxylic Acid Patton and Reeders Reagent

  • C.A.S. No. 3737-95-9
  • M.F. C21H14N2O7S
  • M.W. 438.41gm/mole
  • Dye Content (by Spectrophotometry) >60%
  • Solubility 0.1% (MeOH) Clear solution
  • Absorption maximum (Methanol+1ml 1N HCl) ?max 550-560nm
  • Absorptivity (A1%1cm in Methanol+ 1ml 1N HCL, at ?max) >250
  • Loss On Drying (110°C) <7%
  • Suitability as indicator for Metal Titration Passes test
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Calcon Solochrome Dark Blue

  • C.A.S. No. 2538-85-4
  • CI NO. 15705
  • M.F. C20H13N2NaO5S
  • M.W. 416.39gm/mole
  • Solubility 0.1% (50% EtOH) Clear solution
  • Suitability as indicator for Metal Titration Passes test
  • Absorption maximum (Ammonia buffer pH 12.2+2ml EDTA solution) ?max 632-636nm
  • Absorptivity (A1%,1cm pH 12.2, at ?max on dried substance) >300
  • Loss On Drying (110°C) <10%
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Calmagite

  • C.A.S. No. 3147-14-6
  • M.F. C17H14N2O5S
  • M.W. 358.37gm/mole
  • Solubility 0.1% (Dist. Water) Clear solution
  • Absorption maximum (pH 10.0 in Ammonia buffer+2ml of 0.05M E.D.T.A. Solution) ?max 600-610nm
  • Absorptivity (A1% 1cm at ?max, at pH 10.0 in Ammonia buffer +2ml of 0.05M E.D.T.A. solution on dried >300
  • Loss On Drying (110°C) <10%
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Neutral Red 60%

  • C.A.S. No. 553-24-2
  • CI NO. 50040
  • M.F. C15H17 N4Cl
  • M.W. 288.78gm/mole
  • Dye Content (by Spectrophotometry) >60%
  • Transition Range Ph 6.8-8.0 Violet Red- Yellow
  • Solubility 0.1% (50% EtOH) Clear solution
  • Absorption Maximum (50%EtOH+2ml Acetic Acid) ?max 539-544nm
  • Absorptivity (A1%,1cm in 50% EtOH+2ml Acetic Acid, at ?max) >920
  • Loss On Drying (110°C) <8%
  • Suitability for microscopy Passes test

Chemical Name

Phenazine, 3-amino-7-(dimethylamino)-2-methyl-, hydrochloride

 

InChI Key

PGSADBUBUOPOJS-UHFFFAOYSA-N

 

Solubility

Soluble in water (50 mg/ml at 25° C), abs. alcohol (1.8%), and cellosolve (3.75%).

 

Neutral red (toluylene red, Basic Red 5, or C.I. 50040) is a eurhodin dye used for staining in histology. It stains lysosomes red. It is used as a general stain in histology, as a counterstain in combination with other dyes, and for many staining methods. Neutral Red is a weak cationic azine dye that is used extensively as a nuclear stain in a variety of biological stain applications. It is a pH indicator as well, changing color from red to yellow over the pH range 6.8-8.0. It is also incorporated into bacteriological growth media.

 

Applications:

The high-purity neutral red is a common lysosomal probe that stains lysosomes a fluorescent red.A hydrochloride obtained by combining the free base of neutral red with one equivalent of hydrochloric acid. Neutral red acts as a pH indicator, changing from red to yellow between pH 6.8 and 8.0.It is used to stain embryonal tissues and supravital staining of blood. Can be used for staining Golgi apparatus in cells and Nissl granules in neurons. In microbiology, it is used in the MacConkey agar to differentiate bacteria for lactose fermentation. Neutral red can be used as a vital stain. Live cells incorporate neutral red into their lysosomes. As cells begin to die, their ability to incorporate neutral red diminishes. Thus, loss of neutral red uptake corresponds to loss of cell viability. It is also used to stain cell cultures for plate titration of viruses. Neutral red is added to some growth media for bacterial and cell cultures. It usually is available as a chloride salt.

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Neutral Red 95%

  • C.A.S. No. 553-24-2
  • CI NO. 50040
  • M.F. C15H17 N4Cl
  • M.W. 288.78gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Transition Ph 6.8-8.0 Violet Red- Yellow
  • Solubility 0.1% (50% EtOH) Clear Solution
  • Absorption Maximum (50%EtOH+2ml Acetic Acid) ?max 539-544nm
  • Absorptivity (A1%,1cm in 50% EtOH+2ml Acetic Acid, at ?max) >1440
  • Loss On Drying (110°C) <8%
  • Suitability for microscopy Passes test

Chemical Name

Phenazine, 3-amino-7-(dimethylamino)-2-methyl-, hydrochloride

 

InChI Key

PGSADBUBUOPOJS-UHFFFAOYSA-N

 

Solubility

Soluble in water (50 mg/ml at 25° C), abs. alcohol (1.8%), and cellosolve (3.75%).

 

Neutral red (toluylene red, Basic Red 5, or C.I. 50040) is a eurhodin dye used for staining in histology. It stains lysosomes red. It is used as a general stain in histology, as a counterstain in combination with other dyes, and for many staining methods. Neutral Red is a weak cationic azine dye that is used extensively as a nuclear stain in a variety of biological stain applications. It is a pH indicator as well, changing color from red to yellow over the pH range 6.8-8.0. It is also incorporated into bacteriological growth media.

 

Applications:

The high-purity neutral red is a common lysosomal probe that stains lysosomes a fluorescent red.A hydrochloride obtained by combining the free base of neutral red with one equivalent of hydrochloric acid. Neutral red acts as a pH indicator, changing from red to yellow between pH 6.8 and 8.0.It is used to stain embryonal tissues and supravital staining of blood. Can be used for staining Golgi apparatus in cells and Nissl granules in neurons. In microbiology, it is used in the MacConkey agar to differentiate bacteria for lactose fermentation. Neutral red can be used as a vital stain. Live cells incorporate neutral red into their lysosomes. As cells begin to die, their ability to incorporate neutral red diminishes. Thus, loss of neutral red uptake corresponds to loss of cell viability. It is also used to stain cell cultures for plate titration of viruses. Neutral red is added to some growth media for bacterial and cell cultures. It usually is available as a chloride salt.

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Tropaeolin O

  • C.A.S. No. 547-57-9
  • CI NO. 14270
  • M.F. C12H9N2SO5Na
  • M.W. 316.27gm/mole
  • Solubility 0.1% (Dist. water) Clear solution
  • Transition range pH 11.2-12.7 Yellow-Orange
  • Absorption maximum (0.1N NaOH) ?max 488-493nm
  • Absorptivity (A1%/1cm in 0.1N NaOH, at ?max) >550
  • Loss on drying (110°C) <5%
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Bromocresol Green ACS Grade

  • C.A.S. No. 76-60-8
  • M.F. C21H14Br4O5S
  • M.W. 698.04gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Transition Range pH 3.8-5.4 Greenish Yellow-Blue
  • Solubility 0.1% (95% EtOH) Clear solution
  • Absorption maximum (pH 3.8) ?1max 438-443nm
  • Absorption maximum (pH 5.4) ?2max 615-618nm
  • Absorptivity (A1%/1cm at pH 3.8 at ?1max) 240-270
  • Absorptivity (A1%/1cm at pH 5.4 at ?2max) 530-570
  • Loss On Drying (110°C) <3%

Chemical Name

3, 3-Bis(3, 5- dibromo-4- hydroxy-2- methylphenyl)-

3H-benzo[c][1, 2]oxathiole 1, 1-dioxide

 

InChI Key

FRPHFZCDPYBUAU-UHFFFAOYSA- N

 

Bromocresol Green is a dye of the triphenylmethane family (triarylmethane dyes). It binds quantitatively with human albumin forming an intense blue-green complex with an absorbance maximum at 628 nm.

 

Format Powder

pH 3.8 - 5.4, yellow to blue(Lit.)

 

Solubility

Soluble in water (6 mg/mL), ethanol (40 mg/mL) or methyl cellosolve (200 mg/mL).

 

Storage and Handling: Store at Room Temperature(15- 30 °C).

 

Density : ~2.1 g/cm 3 (Predicted)

 

pK a : 4.24 (Predicted)

 

Applications

Bromocresol Green is useful in a variety of colorimetric detection technologies. It is used as a tracking dye for DNA agarose gel electrophoresis, in protein determinations and in charge transfer complexation processes. In TLC, it is used for visualisation of the compounds with functional groups whose pKa is below 5.0. Bromocresol green is a pH indicator and reagent. It has been used in serum albumin determinations and as a pH indicator.It is a pH sensitive triphenylmethane dye useful in various colorimetric detection studies and as an activity tracking dye for DNA agarose gel electrophoresis. It is also used in TLC (thin-layer chromatography) for visualizing compounds containing functional groups having pKa less than 5.

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Bromophenol Blue ACS Grade

  • C.A.S. No. 115-39-9
  • M.F. C19H10Br4O5S
  • M.W. 669.99gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Transition Range pH 3.0-4.6 Greenish Yellow-Blue
  • Solubility 0.1% (95% EtOH) Clear solution
  • Absorption maximum (pH 3.0) ?1max 434-439nm
  • Absorption maximum (pH 4.6) ?2max 590-593nm
  • Absorptivity (A1%/1cm at pH 3.0 at ?1max) 350-385
  • Absorptivity (A1%/1cm at pH 4.6 at ?2max) 940-1000
  • Loss On Drying (110°C) <1%

Chemical Name

Phenol, 4, 4'-(3H-2, 1-benzoxathiol-3-ylidene)bis[2, 6-dibromo-, S, S-dioxide

 

InChI Key

UDSAIICHUKSCKT-UHFFFAOYSA-N

 

Solubility

Soluble in acetic acid.Soluble in water (about 0.4 g/100 mL); more soluble in methyl and ethyl alcohol, and in benzene. Freely soluble in NaOH solutions with the formation of a water-soluble sodium salt.In water, 3 mg/mL

 

Bromophenol blue is an acid-base indicator since its useful range lies between pH 3.0 and 4.6. It changes from yellow at pH 3.0 to blue at pH 4.6; this reaction is reversible. Bromophenol blue is structurally related to phenolphthalein (a popular indicator). Bromophenol blue is also used as a color marker to monitor the process of agarose gel electrophoresis and polyacrylamide gel electrophoresis

 

Applications:

Chemicals and substances that impart color including soluble dyes and insoluble pigments. They are used in INKS; PAINTS; and as INDICATORS AND REAGENTS.Concentrations of bromophenol blue (I) in plasma, urine, and bile were determined spectrophotometrically after intravenous bolus injections and infusions in rats. The plasma concentrations were found to decrease mono exponentially after all doses except the highest, where the decrease was biexponential. Bromophenol blue (BPB) is the most widely used stain in gel electrophoresis for tracing the migration of samples on electrophoretic gels. If the gel is staind with 1 - 5 mg bromophenol blue, this may be detected much easier and earlier. In case that the stain will interfere with other applications (e. g. silver staining), a pre-run of the gel will remove bromophenol blue. It does not influence the migration of the samples. Add the solid stain before adding the catalyst.

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Pyrocatechol Violet

  • C.A.S. No. 115-41-3
  • M.F. C19H14O2S
  • M.W. 386.38gm/mole
  • Solubility 0.1% (MeOH) Clear solution
  • Absorption maximum(in MeOH) ?max 442-446nm
  • Absorptivity 1%, 1cm (in MeOH)at ?max >360
  • Loss on drying (110°C) <7%
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O-Cresolphthalein

  • C.A.S. No. 596-27-0
  • M.F. C22H18O4
  • M.W. 346.38gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Appearance White-Off white powder
  • Solubility 0.1% (EtOH) Clear solution
  • Transition Range pH 8.2-9.8 Colorless-Red
  • Absorption maximum (0.1N NaOH) at ?max 564-568nm
  • Absorptivity (A1%1cm in 0.1N NaOH at ?max) >1670
  • Loss On Drying (110°C) <1%

Chemical Name

3, 3-Bis(4-hydroxy-3-methylphenyl)-2-benzofuran-1(3H)-one

 

InChI Key

CPBJMKMKNCRKQB-UHFFFAOYSA-N

 

Solubility

Solubility Slightly soluble in water; soluble in ethanol

Cresolphthalein is a pH indicator used in titrations. It is insoluble in water but soluble in ethanol.

 

Applications:

o-Cresolphthalein due to its sharp and contrasting color change has potential of being used in many consumer products related to sanitation and visual confirmation Hence, the derived applications are in sensors, display device, photoresists, recording materials, imaging materials, authentication system for secure documents, decoder system, lithium cells, electroplating process, inks, markers, toners, correction fluid, paints, adhesives, floor coatings, gas leaking detector for safety in industries, toys, food storage, diapers, determination of calcium, lotions, urine analysis test strips, drugs and blood analysis

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Phenol Red ACS Grade

  • C.A.S. No. 143-74-8
  • M.F. C19H14O5S
  • M.W. 354.38gm/mole
  • Dye Content (by Spectrophotometry) >95%
  • Solubility 0.1 % (95% EtOH) Clear solution
  • Transition Range Ph 6.5-8.2 Yellow-reddish Violet
  • Absorption Maximum (pH 6.5) ?1max 430-435nm
  • Absorption maximum (pH 8.2) ?2max 557-560nm
  • Absorptivity (A1%/1cm at pH 6.5 at ?1max) 600-700
  • Absorptivity (A1%/1cm at pH 8.2 at ?2max) 1100-1200
  • Loss on drying (110°C) <1%

Chemical Name

4-[3-(4-hydroxyphenyl)-1, 1-dioxo-2, 1$l^{6}-benzoxathiol-3-yl]phenol

 

InChI Key

BELBBZDIHDAJOR-UHFFFAOYSA-N

 

Phenol red is a water-soluble dye used as a pH indicator, changing from yellow to red over pH 6.6 to 8.0, and then turning a bright pink color above pH 8.1. As such, phenol red can be used as a pH indicator dye in various medical and cell biology tests.

 

Solubility

Practically insoluble in chloroform, ether. Soluble in aqueous alkali hydroxides or carbonates with red color (removed by boiling with zinc dust).

  • Solubility in water: approximately 1g/1300ml.
  • Solubility in alcohol: approximately 1g/350ml
  • Storage and Shelf Life : Store between 10- 30°C. Use before expiry date on the label.

 

Application

Chemicals and substances that impart color including soluble dyes and insoluble pigments. They are used in INKS; PAINTS; and as INDICATORS AND REAGENTS.Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents.

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Thymol Blue ACS Grade

  • C.A.S. No. 477-73-6
  • CI NO. 50240
  • M.F. C20H19N4Cl
  • M.W. 350.85gm/mole
  • Dye content (Spectrophotometry) > 95%
  • Solubility 0.1 % (50%Ethanol) Clear solution
  • Absorption maximum (50% Ethanol) ?max 530-534nm
  • Absorptivity (A1%/1cm in 50% Ethanol, at ?max > 1500
  • Loss on drying (110°C) < 5%
  • Suitability for microscopy To passes test
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