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Yes actually sort of rusty purple brown ish.
https://kunsten.nu/journal/danmarks-aeldste-museumsvaegge-eftersyn/
Photos in this article shows is quite clearly. It was used in a couple of Danish museums back in the day.
It is related to the development of sulfuric acid.
You are gonna have to Google translate the article.
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Hulsroy
the red goes a bit in the brown direction, right?