Final answer:
The staining color of acidophils with azan is light red, as azan is a trichromatic stain that colors acidic tissue components red to magenta.
Step-by-step explanation:
In histological staining techniques, acidophilic structures are those that are basophilic and bind to acidic dyes. Azan is a trichromatic stain that includes azocarmine and aniline blue as part of its composition, staining acidic tissue components. Acidophils, often found in the anterior pituitary gland among other locations, react to these acidic dyes. While azocarmine imparts a red to magenta color to acidic cell components, aniline blue stains basic tissue components. Thus, acidophils stained with azan would most consistently exhibit a light red hue.