: to make (something) more attractive usually by putting something on it.
There are several types of mercury. They include metallic mercury, and both inorganic and organic mercury compounds. Many of these forms are found in our environment, however, the most common natural forms include metallic mercury, mercury sulfide, mercuric chloride, and methylmercury (http://www.atsdr.cdc.gov/toxprofiles/tp46.html).
Inorganic mercury toxicity occurs in several forms: metallic mercury (Hg), mercurous mercury (Hg1+), or mercuric mercury (Hg2+). Found mostly in the mercuric salt form (eg, batteries), inorganic mercury is highly toxic and corrosive.