For example I have a 2003 dollar that feels really soft to the touch and easy to fold, but then I also have a 2021 dollar that feels almost crisp to the touch, just like printer paper does but almost rougher, and that one is actually pretty tough to fold. I know the fact that they’re made of linen and cotton probably has to do with it, but why does age play a role?
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Paper is made of fibers and touching/crumbling creates friction that wears down fiber and rips it apart eventually so it gets softer. Similar to how bedsheets and clothes become softer the more you wash them.
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