A friend of mine was talking about Ruthenium. He said it was over $900/oz. around a decade or so ago and recently was all the way down to the low $40's. Now it is in the low to mid-$60's. He says it is easier to sell in powder form rather than bar form and that the bid/ask spread is fairly tight for something so exotic.
Questions- I've read that it is explosive, so if I leave it in a hot car in the summer, would that release toxins or potentially cause an explosion? Are there any precautions that need to be taken before storing this long-term? Also, how do you authenticate something like this that most people (perhaps including dealers) have never handled?
Any ruthenium answers, websites or expertise would be greatly appreciated.