A poison which is illuminous, translucent and waxy?

D i.e. Yellow phosphorus - Yellow (or white) phosphorus exists in translucent, waxy, luminous cylinders of garlicky smell & tasteQ. - Iodine occurs as brown (bluish-black), soft and scaly crystals with a metallic lusture and unpleasant taste. It gives off violet coloured vapour having a characteristic odour at all temperatures. - Caustic alkalis occurs as white powders. Whereas venom (salive) of cobra is faint transparent yellow and slightly viscous which becomes slightly turbid when exposed to sun.