: 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).
The most dangerous form of mercury is monomethylmercury, which living things such as fish and humans canât easily get rid of, so it accumulates to high, toxic levels in their tissues. However, other forms of mercury also can cause problems, if exposure to it is prolonged or frequent.