What are the differences between analytical biological dyes and indicators?

     What are the differences between analytical biological dyes and indicators? Biological stain is a selective dye that can be used to identify specific substances such as DNA, protein, lipids, sugars and so on. An indicator is a group of compounds that change color with the pH of the solution in its specific pH range, usually organic weak acid or organic weak base. Chemical analysis biological stain and indicator of what is the difference? In chemical reagents, a class of reagents with color or color change can be collectively referred to as a pigment reagent, which includes indicators, color reagents and dyes. Is encountered in acid and alkaline pH indicator.