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Methyl red solution

2 %, for microbiology
Examples of effect: Flammable; liquids form compounds with the air which can become explosive; produce flammable gases with water or can self-combust. Safety: Keep away from open flames and sources of heat; close containers tightly; store in a fire-safe manner.
Examples of effect: Lead to damage to heath, cause irritation to eyes, skin or respiratory organs. Are fatal in larger quantities. Safety: As previously stated, in the event of skin irritation or contact with eyes, rinse with water or a suitable medium.
i highly flammable liquid and vapour, causes serious eye irritation
P210 P305+P351+P338
i keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking, IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing
Pack Qty.
Empirical formula C15H15N3O2
Molar mass (M) 269,31 g/mol
Density (D) ~0,79 g/cm³
Boiling point (bp) 78 °C
Flash point (flp) 22 °C
Melting point (mp) -114 °C
Storage temp. +15 to +25 °C
Transport temp. ambient temp.
CAS No. 493-52-7
UN-Nr. 1170

Indicator solution for testing mixed acid fermentation in enterobacteria.

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€55.40/Pack Qty. 

excl. VAT. | 100 ml per Pack Qty.

Art. No. 1HHP.1

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Product details

Methyl red solution 2 %, for microbiology

Acid formation during mixed acid fermentation is detected with the methyl red test (MR test).

Mixed acid fermentation produces a lot of acid (pH<4.4), which leads to a deep red colour (positive) after adding the methyl red solution. If no mixed acid fermentation takes place, little acid is present and a yellow/orange colour (negative) results.

The methyl red test is part of the Bunte series for the differentiation of bacteria, especially from the Enterobacteriaceae group.

Technical Information
Use Methyl red test, MRVP test 
Methyl red solution
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1HHP.1 100 ml glass


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Downloads / MSDS

Type analysis

Appearanceclear, red liquid
Concentration2 %
Suitability for microscopycomplies