Pic unrelated

    • shalafi@lemmy.world
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      8 hours ago

      You got a solid explanation but I’ll add this; No one could press their hand on that hot engine long enough to make a perfect print like that. Somebody did it for giggles.

    • Warl0k3@lemmy.world
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      14 hours ago

      It’s oil from your skin. The pretty heat colors on the stainless steel are a result of oxidization of the metal, which reaches different depths as it gets hotter - but if the metal is heated rapidly enough, or to a low enough temperature the steel will begin to discolour before the oils burn off. Since the area with skin oil on it has a barrier between the metal and the oxygen (the oil), the outline of the hand is prevented from gaining a color and thus it shows up like this.

      • espurr@sopuli.xyz
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        14 hours ago

        Ah ok that was interesting to learn and also that it’s just oils from skin

        • Warl0k3@lemmy.world
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          14 hours ago

          It’s neat to see in person, with a light touch you can easily see the distinct patterns of a person’s fingerprints outlined in some really pretty colors.

        • BurntWits@sh.itjust.works
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          10 hours ago

          My name is Elongated Musket and I’m worth half a quintillion dollars and I have 800 kids who all hate me and I’ll die alone with my fortune and wood stove collection and no one can stop me and—

    • balsoft@lemmy.ml
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      14 hours ago

      If it’s properly insulated, might be fine. I’ve had a metal hearth with a lot of insulation under it and there weren’t any issues. But if it’s a wooden house and there’s not enough insulation, it might set shit on fire.

    • Mouselemming@sh.itjust.works
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      12 hours ago

      If it’s conducting a lot of heat and a kid sits on it they could get hurt. But I think most of a fireplace’s heat travels upward in the rising gases. IANASOE

      (I am not a scientist or engineer)

      • Drewmeister@lemmy.world
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        11 hours ago

        Wood stoves have something called a baffle plate that redirects hot air so that it flows along the interior top of the unit before leaving through the chimney. The purpose is to heat the metal enough for radiation tranferrance. I often put a ceramic-coated cast iron kettle on top, and it will boil if left for a while. Anyone who sits on the stove would have a very bad time.

        Built in fireplaces work differently but aren’t typically sit-onable.

      • SatansMaggotyCumFart@piefed.world
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        14 hours ago

        Lots of people have steel hearths and not many of those people fry an egg on them.

        If you’re getting it hot enough to do that you have issues and you’d probably crack the concrete or stone at the point.