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Hot Crucible Indicator

This will allow you to actually SEE the status of a sealed crucible so you
won't accidentally use the tongs on the ones that have already been fired or cooled.

The crucibles will flash red when they are still hot. Once they have cooled, the color will turn back to normal and the lid will appear slightly open.
This goes for steel, copper, zinc, and electrum ore.

An extra feature I have added is a visual tweak to the steel pipes so you can instantly differentiate them from the steel rods.
The holes in them are BLACK.