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)