Used as a dye in various industries, particularly for coloring paper, leather, and textiles, including cotton, silk, and wool for durable black shades. It is also employed in biological staining to enhance the visibility of microscopic structures and in scientific research for experiments involving staining and material structure analysis. In the ink industry, it serves as a key component for producing blue-black inks with sharp, clear color. Additionally, it finds application in the manufacture of polishes and coatings, providing a deep, consistent color; in plastics for improving appearance; and in cosmetics, such as eyeliners or mascaras. Its water-soluble nature makes it easy to incorporate into aqueous solutions for diverse industrial processes.