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Thymol blue indicator appears blue in basic solutions with a pH greater than 8.2.
Acid turns thymol blue from blue to yellow. This color change is due to the change in the chemical structure of thymol blue in response to the acidic conditions.
The color of universal indicator solution in a neutral solution is green.
thymol blue 436, 545 and 595 nm
pH indicator to visually determine the acidity or basicity of a solution. It changes color from yellow to blue depending on the pH of the solution.
Universal indicator is a mixture of several different dyes that change color in response to different pH levels. This allows it to provide a visual indication of the acidity or alkalinity of a solution across a wide range of pH values.