RE: Rural Shots + Replacing Sauna Stones
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It looked like iron deposits. Rust forms from iron reacting with oxygen (burning), and the kiuas is a very hot place. I wouldn't be surprised if it speeds up the rusting process in the stones. Throwing water on the stones also helps.
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Very good point. Those stones must contain quite a bit of iron. They look rusty on the inside. Heat really does speed up oxidation, which is evident from the rusty hulls of military vehicles that have been hit. The metal is rapidly oxidized and the vehicles look as if they had been exposed to the elements for decades.