Bromothymol Blue is a chemical indicator widely used in analytical chemistry, biology, and educational laboratories to observe changes in pH. With the chemical formula C₂₇H₂₈Br₂O₅S and CAS Number 76-59-5, it is valued for its clear and visible colour response to changes in acidity and alkalinity.

In acidic solutions, Bromothymol Blue typically appears yellow. Around neutral pH, it transitions through green, while in alkaline solutions, it becomes blue. Its colour transition range is approximately pH 6.0–7.6, making it particularly useful for monitoring pH changes near neutral conditions.

Bromothymol Blue is commonly used in acid-base experiments, titration demonstrations, biological research, water testing, and laboratory investigations involving pH changes. It may be supplied as a powder or formulated indicator solution, depending on the product.

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

Safety Note: Avoid direct contact with the eyes and skin, and prevent inhalation of powder. Use appropriate personal protective equipment and follow standard laboratory handling practices.