I remember from a diagram somewhere that the detonator is lead azide. Wiki says that stays stable in storage.
Then again, the TNT filler doesn’t last forever:
“TNT is prone to exudation of dinitrotoluenes and other isomers of trinitrotoluene. Even small quantities of such impurities can cause such effect. The effect shows especially in projectiles containing TNT and stored at higher temperatures, e.g. during summer. Exudation of impurities leads to formation of pores and cracks (which in turn cause increased shock sensitivity). Migration of the exudated liquid into the fuze screw thread can form fire channels, increasing the risk of accidental detonations; fuze malfunction can result from the liquids migrating into its mechanism.”
Indeed.And that is why I say it is inert.How ‘bout you?
Lots of funny comments here, but you make a good point. If it was a live grenade, the explosive could have become unstable over time. I’m thinking the best thing would be to put the grenade in a large bucket of water and then call the police to pick it up.