What is the function of Bromophenol Bule in PAGE electrophorosis?

Question

What is the function of Bromophenol Bule in PAGE electrophorosis?

Answer 1

Bromophenol blue is also used as a color marker to monitor the process of agarose gel electrophoresis and polyacrylamide gel electrophoresis. Since bromophenol blue carries a slight negative charge at moderate pH, it will migrate in the same direction as DNA or protein in a gel; the rate at which it migrates varies according to gel density and buffer composition, but in a typical 1% agarose gel in TAE buffer or TBE buffer, bromophenol blue migrates at the same rate as a DNA fragment of approximately 500 base pairs. Xylene cyanol and Orange G may also be used for this purpose.

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Answer 2

I believe its sole function is that of a tracking dye