The metal is made in layers that alternate from 1 to 4 microns of pure bismuth with a magnesium-zinc alloy that is 100 to 200 microns thick. For comparison, a human hair is about 100 microns wide, so that’s about the size of the magnesium-zinc layers. A red blood cell is about 8 microns in diameter. So the pure bismuth layer is twice the width of a red blood cell.
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