I supposed it's fitting that a photograph taken near the site of an old polluted mine would look like a heavy metal. This was taken near the previous shot, looking into the sun, using a dark neutral density filter, and exposing for 10 seconds. The results were a complete surprise.
Spenceville Wildlife Area, California.
We know that Mercury is one of the bad boys of toxic chemicals, although for some applications a suitable substitute has not been found. It was used heavily in gold mining to separate minute amounts of gold from the ore. A fairly recent USGS report indicates that there are still 10,000,000 lbs of Mercury left in the hillsides of California.