The color is dark blue.
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Bromothymol blue has no household uses.
No, bromothymol blue is not typically used in blue food coloring. Blue food coloring usually contains synthetic colorants such as Brilliant Blue FCF (Blue 1) or Indigo Carmine (Blue 2), which are specifically approved for food use by regulatory agencies. Bromothymol blue is more commonly used as a pH indicator in laboratories and not intended for consumption.
Hydrogen Chloride (HCl) is an acid. Bromothymol blue turns yellow as HCl is placed in it. Acids change the color of bromothymol blue from green-yellow, depending on whether it is a strong acid or a weak acid.
Bromothymol blue is the pH indicator used in the citrate test. It turns blue at an alkaline pH, indicating that citrate has been utilized by the bacteria.
Two solutions that can be used to test for carbon dioxide are limewater (calcium hydroxide solution) and bromothymol blue indicator. Limewater turns milky when carbon dioxide is present, indicating the formation of calcium carbonate. Bromothymol blue changes color from blue to yellow in the presence of carbon dioxide.