Hi ands welcome to the board, glad to have you with us. To make the mark on the base stand out more I have two suggestions: firstly, sprinkle a little talc or fine cornflour or similar into the mark and gently blow off the excess, that will highlight the marks themselves and make them show uup better on a photo, and secondly, if you have a macro setting on your camera (usually marked by a little flower symbol) then use that to take a picture of the mark with. Focus from around 8"-10" away works well normally, or if no macro, try standing a bit further back (2'-3') and use the zoom if you have one instead. Hope this helps.