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Mystery 'Grenade' in the news

My first thought was from a No 73 where the outer casing had rusted away leaving a block of HE. However it bursting into flames when poked may indicate a degraded phosphorus content.
 
Phosphorus should burn when exposed to air, so it doesnt seem like its phosphorus. Some HE will burn when exposed to flame or heat though.
 
We have this problem on german beaches since many years. Some beaches post signs warning of this danger. Millions of tons of munitions were dumped in the sea after WW2. The above newspaper article refers to whale-vomit (Amber). Here mostly people searching for "Bernstein"(Amber)are affected. When bombcasings of incendiary bombs rot all through the contents is washed away by the waves. Stuff like Napalm may then appear on the beach looking brownish like Amber. When there are inclusions of white phosphorus the stuff starts burning as soon as it gets dry, often in peoples pockets.
 
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