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Older incandescent light bulbs do not contain liquid mercury.  But, some newer energy-saving compact fluorescent light (CFL) bulbs do.  Check the packaging that the bulbs came in for warnings regarding their mercury content.  Energy-saving bulbs typically contain no more than 4 mg of mercury—just enough to cover the tip of a pen. Even if the CFL bulb contains mercury, it might be in gaseous rather than liquid form. LED bulbs don’t contain liquid mercury. Tilt switches (sometimes called “mercury switches”) were used in older appliances to transmit an on/off signal.  Appliances in the home that may contain mercury include chest freezers, televisions, thermostats, washing machines, space heaters, clothes dryers, and washing machines.  Contact the appliance manufacturer or check your user manual to confirm if a given appliance has mercury. Contact an appliance recycler or your local hazardous waste collection center for information regarding the best way to dispose of these appliances. You might be able to locate up to 3 grams of mercury in thermostats. Most normal batteries do not contain mercury.  However, the smaller “button cell” batteries that are used in watches, hearing aids, toys, pacemakers, and other devices still contain mercury.  If you can find a device containing these small batteries, you’ve probably found liquid mercury. Certain pharmaceutical products might contain liquid mercury.  Skin antiseptics, facial creams, contact lens solutions, and some vaccines could contain liquid mercury.  To confirm that your pharmaceutical products contain liquid mercury, check the ingredients label or contact the manufacturer. Clocks from the 1600s or before often used liquid mercury as a pendulum weight.  If you own such a clock, it probably contains liquid mercury.
Identify compact fluorescent light bulbs. Locate mercury in tilt switches. Find mercury in small batteries. Search for mercury in pharmaceuticals. Check antique clocks.