bromothymol blue

Bromothymol blue is a chemical dye often used as a pH indicator to measure acidity or alkalinity. It changes color depending on the pH level of a solution: turning yellow in acidic conditions (pH below 6), green around neutral (pH around 7), and blue in basic or alkaline solutions (pH above 7.6). This property makes it useful in laboratories and science experiments to monitor changes in pH, such as in testing water quality, biological processes, or chemical reactions. Its clear color transition provides an accessible way to assess the acidity or basicity of different substances.