Quote Originally Posted by Damon_Tor View Post
The spell "Heat Metal" explicitly makes the metal red hot, the state required to work with iron via traditional smithing techniques.

So would you allow the spell to allow for blacksmithing in a situation where a forge wasn't available? Or where there's no coal or charcoal to heat the metal?
The spell also makes the "red hot" metal perfectly safe to touch outside the exact moment the caster uses bonus action to have it deal damage. And the heat only affects creatures and doesn't ignite flammable objects in contact with it. There's no mention of damage to the object itself, which there should be it changed temperature so quickly (both when the spell is cast and when it ends). In other words, it doesn't behave like red hot metal in any way except the glow.

No, I wouldn't allow it. The object glows thanks to the magic, not because it is actually heated to "red hot glow"-level temperatures.