It's good to repurpose, but use relatively clean aluminum foil, not anything with food residue. Stack a few clean foil sheets and then fold them into several layers.
As the scissor blades rub against the surface of the foil, it helps remove any small burrs, rust, or other debris that may have dulled them and smooth out rough edges.
While using foil can improve the scissor's cutting by reducing friction and allowing the blades to move more smoothly, restoring them to their original sharpness