Himalayan Salt Crystal Lamps produce negative ions that are essential for our health and well being.The freshness of the air after a thunderstorm, on a mountain top, or by the seaside, are due to the high concentration of negative ions in the air. On the other hand, the reduced wellbeing one feels in highly polluted areas, artificially air conditioned offices, or when certain hot dry wind conditions exist, are usually due to an unduly low negative ion balance (and therefore high proportion of positive ions). Use with: Tealight or Votive candle Note: The lamps are made from salt and take moisture from the air as they heat up. The holder will have a moist feel and a good idea is to place the holder on a plate to catch any moisture that may run off.