Scissors for cutting paper have blades with a blunter angle. This allows for clean cutting through the paper while remaining sharp. They are not sharp enough for cutting fabric effectively.

Fabric scissors have blades with no serrations and a very sharp angle. They are sharper than paper scissors. If they are used to cut paper, they will become dull.

…

All paper products contain minerals that are abrasive and will eventually dull a pair of razor-sharp fabric scissors.

^(sauce)