This spell allows the caster to ward a specific object so that anyone who touches the object or tries to divine its nature believes it to be something else. Legend lore and similar spells return false information about the object, marking it as something it is not. Anyone handling the item must make a Will save or be convinced that it is not the object he seeks. The spell goes so far as to give false information to someone using bardic lore, Appraise, or a Knowledge skill to try to recognize the object or its value.
The warded object does not change appearance in any way; it is the information given by knowledge or divination spells that is changed. A wizard's tome will remain brown with gold trim, but the bard who fails his save will remember that the book he seeks is black with red trim.