Merck, 114413-5G, Bromothymol Blue

General description
Bromothymol Blue, also known as, dibromothymolsulfonphthalein is a sulfonated hydroxyquinone in acidic aqueous solutions. In alkaline solutions, this dye is present as a moderately sized dianion. It is also known as bromthymol blue and dibromothymolsulfonphthalein. It is a pH-sensitive dye that changes color from yellow to blue.
Application
Bromothymol blue dye serves as a pH indicator because of the precise color transition at neutrality. Other applications include: as a vital stain to trace the movement of fluids from the lymph and to define cell walls or nuclei under the microscope
for the demonstration of fungal hyphae within plant roots
in the assessment of the soluble acidity within single rice grains
use in an agar gel medium for enumeration of Bacillus cereus
as a component of several bacterial growth and detection substrates such as cystine lactose electrolyte deficient (CLED/BROLACIN); polymyxin pyruvate egg yolk mannitol bromothymol blue (PEMBA) and MacConkey agar.