# Coloring a SES by electrostatics

Now we will colorize the SES. Find the Representations widget and highlight its representation. Then press Modify Representation in the context menu of the SES. In the newly opened dialog, select the Color By Grid tab.

We will now interpolate the colors of the SES between some selected values. For now the most negative and positive values in the grid are used, but you can also change them to your liking. Just press OK and have a look at the SES.

If you want to, you can try some other settings and colors before we continue with the tutorial. The colors can be changed by clicking on the button Select.