The disposition of a U.S. real property interest by a foreign person (the transferor) is subject to income tax withholding (IRC section 1445). The transferee is the withholding agent. If you are the transferee, you must find out if the transferor is a foreign person.
Looking directly at the crucible when magnesium first reacts with oxygen can damage your eyes. 5 years ago Magnesium metal is burned in air forming magnesium oxide.
Liquid aluminum is silver at low temperature. If you heat it up more it will glow orange, at about the same temperature that solid steel will glow orange. See the photo of the aluminum and crucible both glowing orange. You seem to be arguing a rather dead point though.