How do I dispose of empty of three 16 gram co2 cartridges?

I got them from this airbrush tattoo thing and they are empty. I don%26#039;t think I can just throw them away. I don%26#039;t know what to do with them.|||I believe with your aluminum cans in the recycling.|||they can be thrown in the trash. there is nothing harmful in these cartridges.|||Co2 is harmless, the steel tubes are also harmless.


But if you still dont want to toss em away you can always make them into something..


I remember a buddy and I once filled one with some boom powder we had left over stuck a fuse in it, lit it and ran. It was fairly cool!!