Saturated Clerici solution is more dense than spinel, garnet, diamond, and corundum, as well as many other minerals.

[4] The change in density is due to the increased solubility of the heavy thallium salts at the higher temperature.

The refractive index shows significant, linear and well reproducible variation with the density; it changes from 1.44 for 2 g/cm3 to 1.70 for 4.28 g/cm3.

[2] The color of the Clerici solution changes significantly upon minor dilution.

Clerici solution was used by the serial killer Tamara Ivanyutina to poison her victims.