If you do casual magic...things you can just throw into your pocket in the morning, and be set to go all day... then Reusable is a great addition to your repertoire. It is an impromptu restoration that happens right under their noses! 
A signed sticky note gets torn in half...and immediately gets visually restored. 
It is that direct. 
It is easy to do.
Hand out the restored signed note at the end as an unforgettable souvenir.
This is casual pocket magic at its best! 
This is reusable.