The white phosphorus (WP) grenade is an incendiary grenade that produces intense heat by means of a chemical reaction, burning at 2,800 °C (5,070 °F). The damage potential of WP grenades comes not only from the heat it produces, but also from the chemical itself - as the body is exposed to the grenade it may absorb the poisonous phosphorus, leading to deep burns and possible organ failure.
While the use of WP grenades is not against any international law, it is considered to be a rather cruel way of harming/killing an opponent and is particularly effective in shocking the enemy.
Soviet forces operating in Tselinoyarsk in the early 1960s, possessed white phosphorus grenades. These variants weighed 0.8kg each.
White phosphorus grenades were also used during Liquid Ocelot's Insurrection.