Metallic mercury and its vapors are extremely difficult to remove from such items as clothes, furniture, carpet, floors, walls and electronic equipment such as computers. The vapors can also accumulate in walls and other structures in rooms. Contamination from mercury spills can pose a risk for many months or years. The threat exists not only to persons currently residing in that structure, but also to those who subsequently occupy that dwelling. It is important to avoid using metallic mercury.
Appropriate substitutes are available for nearly all uses of metallic mercury.
If it is necessary to use metallic mercury, make sure it is safely stored in a leakproof container and kept in a secure place. Long-term exposure to mercury can cause permanent damage to the brain, kidneys and the development of unborn babies. Mercury has not been shown to cause cancer in humans. Organic mercury from eating contaminated fish or grain may cause greater harm to the brain and to developing fetuses than to the kidneys. Mercury vapors may cause greater harm to the brain, while inorganic mercury salts in water supplies or in contaminated foods may cause greater harm to the kidneys.