What format is returned from colorPalette.getColor ()? Hex, RGB etc

Hi there

I am attempting to change one line in pbiviz.json file to update the color:

Change json code from:

var m = e.getColor(h.toString());

(above works and cycles through the different colours in the colour pallette)

To (does not work):

var m=\"#ED1C24\";

or

var m=\"ED1C24\";

or

var m=\"red\";

None of the above works, and the visual always comes out black, irrespective of the hex code / color name used.

My query is then what does e.getColor(String) return? 

Thank you