What color is "bromothymol blue"?

Answer by  diabro (35)

When blue, bromothymol blue is a deep, hard blue, but can also be yellow or green depending on the acidity of the base it is in.

Answer by  ChuckMoeller (10)

It's not just a color but a chemical indicator use to check for acids and bases; if you add this indicator (whose normal color is violet) to a solution, it turns blue if the solution is basic, green if neutral and yellow if acid.