Gazing Mirror
A black gazing mirror seems to work better for some people than a crystal. It is not difficult to make one for yourself. You need a piece of glass, free of flaws and imperfections. Make it opaque by coating one side three times with asphaltum. To make the asphaltum stick to the glass, first clean the glass well with turpentine, then lay on the asphalt with a camel-hair brush.
A much easier method is simply to spray the back side of the glass with a good black enamel paint (it may not seem very magickal, but don't forget, the mirror is merely a focal point for your concentration. The actual "images" are projected by your powers; they do not come from within the mirror, or crystal, itself). A concave glass is the ideal. It is sometimes possible to find a convex glass from an old clock-face, in an antique store, and simply reverse it so that it is concave. Place the glass in a frame. The shape is not important: round; oval; rectangular; square. Carve, or paint, onto the frame the names of the Lord and Lady, in runes or one of the other magickal alphabets. As you are doing this-indeed, thoughout the whole operation of making the mirror-concentrate you thoughts on the purpose of the mirror...the projection of scenes from the past, present and future.
Consecrate the mirror in your circle, using the consecration ritual of your choice. When not in use, keep the mirror wrapped in a black cloth.
Buckland's Complete Book Of Witchcraft
by Raymond Buckland
ISBN 0-87542-050-8