Widely used as a pigment due to its intense blue-green color and excellent stability. Commonly found in coatings, plastics, and printing inks where high durability and resistance to heat, light, and chemicals are required. Also serves as a functional component in photovoltaic devices and organic semiconductors because of its strong light absorption and electron-transfer properties. Applied in electrochemical sensors and catalytic systems owing to its ability to coordinate with metal ions and participate in redox reactions. Its structural similarity to porphyrins makes it useful in photodynamic therapy research for targeting and destroying cancer cells upon light activation.