What type of agents are chromogens considered in staining procedures?

Chromogens are agents used in staining procedures that impart color to tissues or cellular components. They are characterized by their ability to provide color when they react with specific biological structures. However, a key aspect of chromogens is that the colors they impart are often removable, particularly in specific staining techniques. This removable nature allows for the visualization of various biological components without permanently altering them, making it particularly useful in histopathology for observing dynamic processes or utilizing secondary detection methods.

In contrast to structural agents which provide stability and are meant to remain part of the tissue structure, or fixatives that preserve tissues by cross-linking proteins, chromogens are specifically designed for temporary color enhancement. This characteristic makes them integral in procedures where clarity and reversibility of the staining are critical.