Grubby,the cannister problem wasn‘t from a reaction of CS to them,it is caused by the process by which the filters in the canister is made.There is no danger as long as the cannister is removed from it‘s packaging in a open area. The problem is wth the C-7 cannisterm,but is being taken care of (or should be) at the unit level by having the CQs open an amount of cannisters from their pckaging prior to issue.The sealed ones can be sefely used as long as I said earlier they are opened in a ventilated enviroment.BTW you would have a better chance of getting cancer from your issue watch than from getting sick from the amount of ammonia of gassing from a canister.It is not even detectable to the human senses.
Now as far a s fullers earth hell yeah fire up that pension,same for HCC1A1 smoke grenades,PCBs in POL products,etc,etc