Goex is black powder and has a sulphur component and that be the bad boy, after ignition or the resulting "Salts". ....
I still recall a poster on my dentist's wall that showed a picture of a wedge of cherry pie. Tha caption read;
Five minutes after eating me, I start eating your teeth.
SALTS;
One half hour after creating me, I start eating your gun ....
Be Safe !!!