This is chromium electrowinning plate from the electrolytic purification of chromium. Why it was discarded (and then bought up by John Wechselberger from a scrap yard) I don't know, because it looks like very nice stuff. I got these directly from John, but the source is listed as his eBay partner, because that is where you can get some of your own from.
I chose this sample to represent its element in my Photographic Periodic Table Poster. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
Source: eBay seller akilawolf
Contributor: Theodore Gray
Acquired: 21 August, 2003
Text Updated: 4 May, 2007