: 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).
HgS is dimorphic with two crystal forms: 1  red cinnabar (Î±-HgS, trigonal, hP6, P3221), is the form in which mercury is most commonly found in nature. 2  black, metacinnabar (Î²-HgS), is less common in nature and adopts the zinc blende (T2d-F43m) crystal structure.