It is primarily used in demonstrations to produce the Pharaohs serpent effecta coiling ash-like snakeupon ignition and historically in analytical chemistry and pyrotechnics.

Its main purpose is as a demonstration reagent for exothermic decomposition reactions that generate voluminous solids via mercury sulfide and carbon nitride formation while also serving in qualitative analysis for mercury detection.

Mercury(II) thiocyanate is a white light-sensitive powdery solid chemical compound with the formula Hg(SCN) notable for its polymeric structure where Hg ions are linearly coordinated to sulfur atoms from thiocyanate ligands.