Acid Red 92, widely known as Phloxine B, is a brilliant xanthene dye that produces an intense, bluish-pink colour with strong fluorescence. It is a member of the fluorescein family and shares many properties with Eosin Y, but with a more bluish undertone. Its primary use is as a biological stain, providing a strong red colour to various cell components. Industrially, its vibrant shade makes it a popular choice for specialty inks, particularly for red pens, and for dyeing textiles where a bright, fluorescent magenta is needed.