Widely used as a dye and pigment in inks and coatings, especially for producing intense blue and green shades with high stability. Employed in textile printing due to its strong affinity for cellulose fibers and excellent lightfastness. Applied in the formulation of electroconductive materials and sensors, taking advantage of its metallo-organic structure and electron-transfer properties. Also investigated for use in photodynamic therapy and as a catalyst in organic synthesis, where its sulfonated groups enhance solubility and reactivity in aqueous systems.