If we use a black metal we can't see the spark. View waving flag in the beta and in the current version You will understand what I mean. And for the solution there can be an on off thing to turn of colored glowing spark
@CAC-Boomerang(View Post) he means that there should be an option to turn on and off the 'glow' effect when SPRK travels though a conductor, and the glow should be correspondent to the color of the conductor if it is deco layered.