Put it in small plastic containers, fun and pretty safe. If you’re going to pack it into car bodies or prepare pails of it, shoot it with a scoped rifle at over 100 yards
Not going to name the site (and nobody else should either) but some numbnuts taped a jar or two behind the fuel door on a junker Suburban that was 80+ yards from the firing line. Mrs. Mountain took one for the team- it hit her squarely in the shin. It had been folded cleanly in half by the blast and a jagged piece cut her shin but otherwise it hit her flat across. If it had hit her edgewise it would have shattered her tibia.
Lesson here? Don't put anything between you and the tannerite unless you are 100 yards or more away and you have some cover. Pumpkins and watermelons excepted.
Another tip- if you put it in a pumpkin or melon- wait, let me rephrase that: If you put tannerite in a pumpkin or melon leave an opening towards you so that you can hit the jar directly. Otherwise after hitting the flesh of the pumpkin the bullet may be too slow to ignite the charge but it will bust open the jar and spill everywhere.