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I’ll bet electron microscopes could pick up all kinds of distinguishable bread on the floor, in the air, and your on hands if you receive that way. Would that count?Depends on how small the crumbs would be, at some point no one will be able to distinguish it as bread.
If you’ve ever been to a coin show, you will probably find them looking for “rubs” on a particular coin. It doesn’t take that much to change the grade of a coin by simply touching the surface. But the naked eye won’t be able to pick up silver elements in the air or on your fingers.