Does contact fusion work on monsters in your hand?

No, Contact Fusion does not work on monsters in your hand.

Here's why:

* Contact Fusion specifically states that you must "Tribute" monsters on the field.

* "Tribute" means sending a monster from your field to the Graveyard.

* Monsters in your hand are not on the field, so you cannot Tribute them.

Therefore, you cannot use Contact Fusion to fuse monsters from your hand.