The RasMol potential colour scheme applies only to dot surfaces, hence is used in the command "colour dots potential" This scheme colours each currently displayed dot by the electrostatic potential at that point in space. This potential is calculated using Coulomb's law taking the temperature/charge field of the input file to be the charge assocated with that atom. This is the same interpretation used by the colour charge command. Like the charge colour scheme low values are blue/white and high values are red. The table below shows the static assignment of colours using a dielectric constant value of 10.
25 < V red [255,0,0]
10 < V < 25 orange [255,165,0]
3 < V < 10 yellow [255,255,0]
0 < V < 3 green [0,255,0]
-3 < V < 0 cyan [0,255,255]
-10 < V < 3 blue [0,0,255]
-25 < V < -10 purple [160,32,240]
V < -25 white [255,255,255]