I recently have been thinking about color.
On the right are two ink drawings that I used for silkscreens awhile back (on the left).
I colored the ink drawings with markers and the silkscreens are made with drawing fluid.
To apply the colors with the silkscreen, you must paint the drawing fluid on the screen where you want the color to be (do this for each color). Then when it dries you fill the rest of the screen with screen filler. That dries, then you wash out the drawing fluid. Then you can run that color for all of your editions! Repeat. It take one screen per color.