Hennig Brand, one of the many alchemists was in pursuit of the philosopher’s stone. Brand's method is
believed to have consisted of evaporating large quantities of urine to leave a black residue that was then left
for a few months. The residue was then heated with sand, driving off a variety of gases and oils. The final
substance to be driven off, was condensed as a white solid, which he called as “cold fire” as it was luminous
and glowed in the dark and also caught fire on slight warming and producing a large quantity of light. It has also
been called as the “Bearer of light”. Which element is “cold fire”?