The Unstable Ingot is a special and very dangerous crafting ingredient. Once it is crafted, it can only exist for 10 seconds before it explodes. Leaving the Crafting Table menu will cause it to explode early!
The Division Sigil used in the recipe must have a charge.
Unstable Ingots crafted by a non-player cannot be used in recipes.
Mobius "Stable/Unstable" Ingot
Crafting 9 Semi-Unstable Nuggets together will craft a Mobius "Stable/Unstable" Ingot, which does not explode.
Certain recipes may require these Ingots, rather than Unstable ones.
