Used in electroplating baths to deposit smooth, corrosion-resistant nickel coatings on metals, enhancing durability and appearance of automotive and industrial parts. Employed as a catalyst precursor in hydrogenation and desulfurization reactions within the chemical manufacturing sector. Serves as a source of nickel ions in nutrient media for microbial growth in laboratories, especially for genetically engineered organisms requiring nickel-dependent enzymes. Applied in the synthesis of nickel-based battery materials and as a mordant in textile dyeing to improve color fastness. Also utilized in metal surface treatment processes to promote adhesion and in humidity indicator cards where it changes color with moisture levels.