Precautions taken

The solution is heated to ensure that Real World Application : Many modern calculators have a liquid crystal display (LCD). The liquid crystal is sandwiched between two thin pieces of glass in an LCD. The bottom material is a mirror, which reflects the light as it passes though the LCD. The outer material is a piece of conductive glass that changes the arrangement of the liquid crystals molecules beneath it, and stops light from reflecting back, creating the images you see displayed on the screen.