Scrying Catoptromancy
You have found the way to Catoptromancy on Scrying:
How to Make a Scrying Mirror - Instructions on constructing a scrying mirror using a picture frame, glass insert, and black paint.
Magic Mirrors - Comprehensive historical source of information on magic mirrors from archaic sources, including their construction and use.
Psychomantium - An ancient form of mirror gazing that has been popularized by Dr. Raymond Moody, M.D. It has its roots in the oracles of ancient Greece. This type of mirror gazing is used to contact spirits of departed loved ones.
Seeing Into Darkness: Scrying Using the Black Mirror - A how-to that is mirror specific. Includes several purposes for scrying along with instructional material. Help build the largest human-edited directory on the web.