Many commands in EZ Math Movie have a parameter that is a color. For example, setLineColor, if used as follows, will make the color black be the color in which lines are drawn:
setLineColor('black');
Note that the word for the color, black in this case, is in quotes. Here is a list of words for the colors you can use in EZ Math Movie:
'red', 'green', 'blue', 'fuchsia', 'lime', 'aqua', 'maroon', 'olive', 'navy', 'orange', 'yellow', 'teal', 'purple', 'silver', 'black', 'white', 'gray'.