The normal pen color varies between 0 and 200. It is used in the "set pen color to [NUMBER]" block . But it is also possible to use RGB color codes. Using the "set pen color to [COLOR]" block, insert the RGB number in the square where you would leave the eye dropper color. You may even insert here the ARGB number, A being the Alpha-value (opacity) - to set transparancy.
With a little help of @heldlaw & @PinkyPepper http://www.rapidtables.com/web/color/RGB_Color.htm http://en.wikipedia.org/wiki/RGBA_color_space#ARGB
