Quote Originally Posted by MIKE G View Post
I know that the old school QC will still react but well beyond its date but no other details. I used to use expired packs to demonstrate the reaction by pouring into a bottle with a bit of water in it. It was still enough to melt the bottle. Obviously this confirms nothing but the fact that it will react but who knows what byproducts it puts off, whether it is hotter or cooler, etc.
Mmmmm...do you have old/new stuff? Video camera? Maybe an experiment is in order.

I'm sure I have some expired packs of fairy dust lying around if you need a contribution to the effort.

All my new stuff is non exothermic.