Used primarily in electroplating baths to deposit cadmium metal coatings that provide excellent corrosion resistance, especially in aerospace and marine applications. Also employed in the preparation of cadmium-based pigments and in some types of rechargeable nickel-cadmium (Ni-Cd) batteries. Serves as a source of sulfate and cadmium ions in analytical chemistry for calibration and testing. Historically used in luminescent materials and phosphors, though such uses have declined due to toxicity concerns. Its role in research includes studies on metal toxicity and environmental impact of heavy metals. Handle with care due to high toxicity and environmental hazards.