Oil on the surface and surface tension of water will make the water not work too well, just like a drop tries to stay as a drop, it does not cover the area and stay in the lowest spot, on a bigger scale it does work but not well on a really small scale.
Those trail things are interesting, now you need to find them on an unc older cent.
Those trail things are interesting, now you need to find them on an unc older cent.


If you run a tooth pick across the areas in question you will notice if the tip goes up and over the anomalies or drop into them... To me they look incuse... Some times no matter the light angle our eye/brain interconnect does not always work correctly... I know this cause mine does it all the time
Be verwy verwy quiet... I'm hunting coins!!! 
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