The Avengers engulf magnets / infinity stones with magnetic putty.
I found the Hulk, Iron Man, and Captain America shells / eggs at grocery store checkout line.
Noticed that they created a very detailed impression / facial cast when I tried it with my daughter's play-doh.
It wasn't too long till a tried it with magnetic putty.
Crazy Aaron made me some custom colors like green and red to use for Hulk and Iron-man.
Check out Crazy Aaron's Putty World: https://goo.gl/pBKXgZ
Music by: Big Fok