Dissolve crystals of nitrate of copper in spirit of wine; light the
solution, and it will burn with a beautiful emerald-green flame:
pieces of sponge soaked in this spirit, lighted and suspended by fine
wires, produce the lambent green flames now so common in incantation
scenes: strips of flannel saturated with it, and applied round copper
swords, tridents, &c., produce, when lighted, the flaming swords and
fire-forks, brandished by the demons in such scenes: indeed, the chief
consumption of nitrate of copper is for these purposes.