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.
Use a thermocouple to watch the heat. You want to heat the cast iron to 1300ÂªC / 2500ÂªF for fifteen minutes. You will know you have reached this temperature when the crucible's bottom is light yellow, nearly blinding in color. Remove the crucible from the furnace and heat. Add a teaspoon of borax to dissolve all oxides.