Edge Fill Colour dialog box
The Edge Fill Colour dialog box is where you select the colour to use to fill the areas of the fractal between edges. By default, this area is black. Edges are not shown by default. To toggle displaying of edges go to the main window's View menu and select Edges.
To open the Edge Fill Colour dialog box: On the Colour Palette window's Colour menu, click Edge Fill.
The three sliders can be used to specify how much red, green, and blue is in the interior colour, allowing for over 16 million different colours. The preview box shows the colour defined by the R, G, and b sliders.