The scrying mirror is a very old tool that's used for scrying and divination. Often referred to as a black scrying mirror rather than a black mirror it is a very useful addition to a witch's ritual tools. It is an unusual method of divination but has been used for centuries. Nostrodamus for instance, made use of scrying for divination purposes.

Originally it was traditionally made from concave glass which is now very hard (and outrageously expensive!) to obtain so nowadays it is more commonly made from flat glass.

Mirror scrying is in effect a very old form of crystal gazing. Scrying is often considered one of the most difficult methods of divination for several reasons. Unlike more well known methods of divination such as Tarot or runes , scrying can often be much more symbolic and somewhat more difficult to interpret. Most often the answer to intepretation lies within you.