Used in blueprint paper and other photocopying processes due to its light-sensitive properties—exposure to UV light causes it to decompose and form a visible image. Commonly employed in the preparation of iron oxide pigments and as a precursor in the synthesis of catalysts. Also utilized in analytical chemistry for the determination of chromium and other metals through gravimetric or titrimetric methods. Its photochemical behavior makes it suitable for educational demonstrations of photochemical reactions and solar energy conversion experiments.