Flint, Unless I'm mistaken you have received your answer in the Magic Cafe. But for all other interested parties Crystal Vision is what I use to "prove" that spirits contact us in writing. How do we know the writing is done by a spirit? Simple, Their writing can only be read by holding it up to a mirror. This is a simple to perform but very impressive effect. How can this be done? "Write" on the opposite side of the card. If you are going to buy this item I would suggest the Jumbo card size. Easier to work with.