Which component of the dye attributes the dyeing property to it?

The component of a dye that attributes its dyeing properties is called an auxochrome. Auxochromes are functional groups attached to the chromogen (the actual coloring part of the dye) that enhance its ability to bind to the material being dyed, such as tissues in histopathology. These groups can improve the dye’s solubility and increase the affinity for the substrate, thus facilitating the staining process.

By altering the chemical structure through the presence of auxochromes, dyes can achieve different binding characteristics, which makes them effective for various applications in staining techniques. This interaction is crucial in histopathology where staining is used to visualize different components of cells and tissues for diagnostic purposes.