Seed phrase - metal that doesn't melt

Large_McHuge
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I saw a while back someone posted a picture of their engraving kit to record their seed phrase onto a sheet of metal. I plan on doing the same on at least two different pieces of metal, splitting the phrase in half, or maybe even quarters. Has anyone done this? What kind of metal I should use.. something that doesn't melt in a fire, or corrode? Stainless steel?