Are good dyes pure or are they a mixture of different colors? In other words will you get a single band on the gel or multiple bands on the electrophoresis gel ?

Good dyes are typically pure substances, which means they will produce a single band on the gel during electrophoresis. If a dye is a mixture of different colors, it may result in multiple bands on the gel, making it difficult to interpret the results accurately. It is important to use high-quality, pure dyes for reliable and clear results in gel electrophoresis.