Methyl Red is an organic chemical compound with the chemical formula C₁₅H₁₅N₃O₂ and CAS Number 493-52-7. It is commonly supplied as a dark red to reddish-brown crystalline powder. Methyl Red is a pH-sensitive indicator that changes colour depending on the acidity or alkalinity of a solution. It exhibits a red colour in acidic conditions and a yellow colour in less acidic to alkaline conditions, with a transition range of approximately pH 4.4 to 6.2.

Methyl Red is valued for its reliable colour transition properties in chemical and biological testing. Common laboratory applications include acid-base titrations, pH determination, preparation of indicator solutions, analytical chemistry procedures, and microbiological testing. It is particularly used in the Methyl Red test, a biochemical identification procedure that detects stable acid production from glucose fermentation by certain microorganisms.

Its distinctive colour response and pH sensitivity make Methyl Red useful in analytical chemistry, microbiology, biochemistry, and general laboratory research. It may also be used in educational experiments, chemical indicator formulations, and specialised analytical testing. The appropriate grade and purity should be selected according to the requirements of the intended application.

KSFE Malaysia supplies laboratory chemicals and scientific products for research institutions, educational facilities, and general laboratory applications.

Safety Note: Methyl Red may cause irritation to the eyes, skin, and respiratory tract, particularly when exposed to dust. Avoid inhalation and direct contact with the chemical. Handle it using appropriate personal protective equipment, including laboratory gloves, safety goggles, and suitable protective clothing. Store in a tightly closed container in a cool, dry place away from incompatible substances. Follow the supplier's safety data sheet (SDS) for proper handling, storage, and disposal.