After the war vast quantities of the surplus ordnance that was deemed unstable for storage or surplus to requirements, were destroyed on bombing ranges, incendiaries are one example. White phos and thermite bombs were piled up and detonated using a booster charge to initiate the explosion.( Just as they still do in Iraq and in Stan) This method was used all over Europe to destroy ammunition stocks. Although the incendiary you have is corroded and looks harmless, it is possible it still contains a live detonator and these are capable of blowing a hand clean off, that wouldnt be good!