I've been doing some serious DIY. I know there has been many, including myself, who can't tell which side is the shiny side on silnylon. I noticed that when I marked the silnylon with my fabric marker that there was one side that the marker would leave a better visible mark. I did an experiment and started marking both sides of the fabric and wow could you see the difference. I believe that the side with the most silicon does not take the mark as well so I'm figuring this will be the shiny side and placed on the top side of the tarp. What does everyone think about my theory?