Bromothymol blue is a chemical indicator commonly used in lab experiments to determine the pH level of a solution. However, there are several synonyms for this chemical, including BTB, bromothymol sulfone phthalein, and dibromothymolsulfonephthalein. These names refer to the same chemical compound and can be used interchangeably. Apart from being used in the lab, bromothymol blue is also used in various industries such as pharmaceuticals and textiles. Due to its versatile nature, it is essential to know the different names of bromothymol blue to avoid confusion and ensure accurate results in scientific experiments.