Lead(II) thiocyanate is used primarily as a source of thiocyanate ions in analytical chemistry for the detection and quantification of certain metal ions, as thiocyanate forms colored complexes with metals like iron(III). It serves as a reagent in precipitation reactions, particularly in qualitative and gravimetric analysis for lead or thiocyanate ions. Also employed in specialized synthesis routes for coordination compounds requiring thiocyanate ligands. Due to its sensitivity to light and heat, as well as the toxicity of lead, its use is limited to laboratory-scale research and educational experiments in controlled environments.