All I can say about NI3, is I'm thankful my highschool chemistry class only taught us how to make things we couldn't easily find the ingredients for, like enriched uranium for atomic weapons.
Try paintballs.
NI3 is a stupid and dangerous idea.
nitrogen triiodide is not illegal. I don't think its considered an exposive. Nic
Can Iodine crystals even be purchased now...
I don't know about now, but when I was young it came in those kids/junior chemistry sets... along with lots of other "interesting" chemicals.
It is really sad to see what they now try to pass off as a "chemistry" set. No wonder many of today's kids don't have a clue how things work or how to do anything other than play video games.
As I recall, they came in a minimum 1 lb. size...... hence the rather "large" reactions.