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Methyl Red (Indicator)
Methyl Red (Indicator) (Product Code: SCI-633/276) is an analytical reagent grade azo dye indicator used to detect the end point of weak base–strong acid titrations and to run the methyl red test for acid-producing bacteria in chemistry and microbiology laboratories. It comes as a 25 g pack with an MSDS, from which laboratories prepare their own indicator solution. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, a lab chemicals supplier in India.
Specifications
| Parameter | Detail |
|---|---|
| Chemical | Methyl red |
| Type | Acid–base (pH) indicator |
| Grade | Analytical reagent |
| Pack size | 25 g |
| Documentation | Supplied with MSDS |
| Shelf life | Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted. |
| Product code | SCI-633/276 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Methyl Red Used For?
Methyl red is red in acidic solution and yellow in less acidic and alkaline solution, with an orange intermediate. Its colour change lies between those of methyl orange and phenolphthalein, which makes it a good match for titrating ammonia solution or other weak bases with hydrochloric acid, and it is often blended with other dyes to make mixed indicators with a sharper end point.
In microbiology, the methyl red (MR) test forms part of the IMViC series: after incubation in MR-VP broth, a few drops of methyl red solution turn red when an organism such as Escherichia coli has produced stable mixed acids, and stay yellow when it has not. Prepare the indicator solution according to your method, label it clearly and keep the solid dye off skin and benches.
Supplier
ScienceLab is the trade name of Jain Scientific Equipments Private Limited, which sources Methyl Red (Indicator) and supplies it with its MSDS to schools, colleges, microbiology labs and dealers. Export orders are handled under Importer-Exporter Code AAECJ8618A (DGFT), and domestic invoices carry GSTIN 06AAECJ8618A1ZT. See the ScienceLab profile for more about the company.
Related Laboratory Equipment
Reagents and apparatus used alongside methyl red:
- Metiloranzh (Indicator) — methyl orange, which changes colour in more strongly acidic solution.
- Phenolphthalein — the indicator for weak acid–strong base titrations.
- Burette, Class-B, with PTFE Key Stopcock — for controlled delivery of the titrant.
- Ammonium Hydroxide (ammonia water) — a weak base commonly titrated using methyl red.
- Test Tube Rack — holds broth tubes while the MR test is read.
Browse the Laboratory Equipment category for further indicators and glassware.
Frequently Asked Questions
What is Methyl Red (Indicator) SCI-633/276 used for?
Methyl Red (Indicator) SCI-633/276 is used as an acid–base indicator for titrations of weak bases with strong acids and as the reagent in the microbiological methyl red test, which detects bacteria that produce stable mixed acids from glucose.
What colour change does Methyl Red (Indicator) give?
Methyl Red (Indicator) is red in acidic solution and yellow in less acidic and alkaline solution, with orange at the transition. Its change lies between those of methyl orange and phenolphthalein, which is why it is chosen for weak base titrations.
How is Methyl Red (Indicator) used in the MR test?
In the MR test, a few drops of Methyl Red (Indicator) solution are added to a culture grown in MR-VP broth. A red colour means the organism produced stable mixed acids, while yellow indicates a negative result; follow your laboratory's incubation procedure.
How much Methyl Red (Indicator) is in one pack?
One pack of Methyl Red (Indicator) SCI-633/276 contains 25 g of analytical reagent grade dye and comes with an MSDS. Laboratories dissolve small weighed portions to prepare their own indicator solution whenever it is needed.
How should Methyl Red (Indicator) be stored?
Store Methyl Red (Indicator) in its closed container in a cool, dry, dark place away from oxidising agents. Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted.
Who supplies Methyl Red (Indicator) SCI-633/276?
Methyl Red (Indicator) SCI-633/276 is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, to schools, colleges, microbiology and chemistry laboratories and dealers in India and international markets.
Request a Quote
Ask for a quotation for Methyl Red (Indicator) through the contact page or the enquiry cart, stating code SCI-633/276 and the quantity of 25 g packs.
Last updated: 24 September 2026
