Smoldering pipeline pig. Iron sulfides on the pig are reacting to the oxygen in the air, causing an exothermic reaction.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...g_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...peline_pig.jpg
Previously:
https://www.homemadetools.net/forum/...041#post149300
https://www.homemadetools.net/forum/...853#post144335
https://www.homemadetools.net/forum/...569#post143150
https://www.homemadetools.net/forum/...697#post147846
https://www.homemadetools.net/forum/...675#post132965
https://www.homemadetools.net/forum/...841#post156283
https://www.homemadetools.net/forum/...255#post161402
