Comment on So, something weird happened to my jar of flash cotton.

Chais@sh.itjust.works ⁨8⁩ ⁨months⁩ ago

The corroded lid would suggest that there was sulphuric acid left in your flash cotton. As would the yellow colouration of the dissolved metal and the yellow crystals.
So yes, the trash may not have been the best place. At the very least you’ll probably want to neutralize any remaining acid. Your local waste management company probably also wouldn’t be thrilled about explosive material in the trash. Hazardous substances and all.

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