Rock salt is found in mines, where sun's energy dried up the original sea, millions of years ago. Thereafter due to extreme pressure over the centuries, the rocks got a crystalline form. There are thousands of mines across the world, but Naturo uses rock salt from a select few Himalayan mines that produce the purest quality salt.
Air contains positive and negative ions. Positive ions are formed by burning of fuel, operation of appliances such as microwaves and entertainment media such as TVs, computers, etc. The concentration of negative ions is very high in hilly areas and near a beach or waterfall. Rock salt is also a tremendous source of the beneficial negative ions. When rock salt is heated, it releases abundance of negative ions in the atmosphere. These are known to purify the air in a natural manner by neutralizing the ill-effects of the dangerous positive ions.
Naturo Rock Salt Lamps operate on the principle that when the lamp is lit either by a bulb or by a candle, it gets heated and thus releases negative ions in the atmosphere. The more the proportion of negative ions in the air, the better it is for the health.