How i can colour the silver mercury to be red?

To color silver mercury red, you can chemically modify it by reacting it with a compound that forms a red complex. For example, you can react mercury with iodine to form mercury (II) iodide, which is red in color. However, please note that handling mercury and its compounds can be hazardous, so it is important to take proper safety precautions and work in a well-ventilated area.