e/Clerici solution

Information
has gloss	eng: Clerici solution is a solution of equal parts of thallium formate (Tl(CHO2)) and thallium malonate (Tl(C3H3O4)) in water. It is a freely flowing, odorless liquid which changes from yellowish to colorless upon decreasing the concentration of the thallium salts. At a density of 4.25 g/cm3 at 20 °C, the saturated Clerici solution is one of the heaviest aqueous solutions known. The solution was invented in 1907 by the Italian chemist E. Clerici (1862–1938) and introduced to mineralogy and gemology in 1930s as a valuable liquid, which allowed separating minerals by density with a traditional flotation method. Its advantages include transparency and variable and easily controllable density in the range 1-5 g/cm3.
lexicalization	eng: Clerici solution
instance of	c/Thallium compounds