Why is the indicator EBT shows wine red at the beginning and blue at the end?

The EBT (Electrolyte Balance Test) indicator typically shows wine red at the beginning due to the presence of certain acidic compounds in the solution, which create a red color. As the test progresses and the pH level increases, the indicator undergoes a color change to blue, signaling a shift to a more alkaline environment. This transition reflects the chemical reactions occurring during the test, indicating the balance of electrolytes in the sample.