• KillingTimeItself@lemmy.dbzer0.com
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    6 months ago

    ok, but humans also regenerate blood, very slowly but it does happen. So theoretically, you could contract your family members to draw blood to be used to make a longsword out of your family’s bloodline. And have it become an heirloom.

    • Sneezycat@sopuli.xyz
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      6 months ago

      Let’s do the math…

      You can donate three times a year to the red cross (once every 112 days). According to some page, you donate around 10% of your blood volume each time.

      That means, for a volume equivalent of 300 people, you’d need to donate 3000 times, which would take around 1000 years.

      The vampire is going to need more people, or to keep a person alive 1000 years with vampire magic.

      • kernelle@lemmy.world
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        6 months ago

        When you’re harvesting the blood iron of your enemies you don’t have time for ethics. A controlled study managed 4 weeks within ethical boundaries, maybe we can cut that in half unethically. So 14 days, 3000 . 14 = 115 years. So when you torture two people, you could manage to do 58 years. Better start early!

      • ColeSloth@discuss.tchncs.de
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        6 months ago

        You’re off on blood production. “Safe” would be once every six to eight weeks for a pint. Plasma can be taken a lot more often. The red blood cells take a while to replenish.

        But let’s get real. You’re not concerned about your enemy feeling well. Force them to take iron supplements and take a pint every other week. They’ll likely stay alive that way. Fuck em, right?

    • knorke3@lemm.ee
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      6 months ago

      But then you need to feed them iron-rich foods which could be used to make a vegan alternative instead, expanding your potential market.

  • cobra89@beehaw.org
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    6 months ago

    Id love to see the math on the amount of iron in a person’s blood, because I find it HIGHLY questionable that there’s enough iron in only 300 people to make a full iron sword. I’m too lazy to do it myself though.

  • Wirlocke@lemmy.blahaj.zone
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    6 months ago

    Listen there’s definitely enough carbon in the body to boost that into a steel sword.

    If we can make diamonds out of corpses, we can make steel.

        • merc@sh.itjust.works
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          6 months ago

          Way too brittle if it was the weight of a typical sword, and way too heavy otherwise.

          On the other hand, the cutting edge of that sword would be pretty amazing while it lasted.

            • merc@sh.itjust.works
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              6 months ago

              Do you mean just the edge? Because with a sword basically the whole thing other than the handle is the blade.

              But yeah, with a tiny diamond edge you’d probably have the best of both worlds, a light, flexible sword with an ultra-sharp cutting edge.

              Still, the edge probably wouldn’t last for long. If the diamond was attached to a steel blade and the blade flexed, the diamond couldn’t flex and would probably snap.

  • Megaman_EXE@beehaw.org
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    6 months ago

    I was curious how long it would take to make a sword out of your own blood. If my math was correct(it probably isn’t lol) the human body contains around 4.7 to 5.5 liters. And then you can apparently donate like 470 millileters every 8 weeks.

    So take 4.7(assuming the smallest people) X 300 = 1410 L total blood

    1410(total needed) / 0.47(donation amount) = 3000 donations X 8 weeks = 24,000 / 52 = 461.54 years

    • Dave@lemmy.nz
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      6 months ago

      And then you can apparently donate like 470 millileters every 8 weeks.

      Safely. You could probably speed it up a bit if you have a higher risk tolerance.

  • cosmicrookie@lemmy.world
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    6 months ago

    My very rough calculations using 85kg as an average adult weight, results in 153gr of iron

    My problem is, that i dont have any expectations as to how heavy a longsword is but i’d assume it to be a lot heavier!

    After further research it looks like the more appropriate number of humans needed to make an average longsword would be closer to 25.000

    • Dasus@lemmy.world
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      6 months ago

      Males of average height have about 4 grams of iron in their body, females about 3.5 grams; children will usually have 3 grams or less

      300 * 3g = 900g.

      300 * 4,5g = 1350g

      https://en.m.wikipedia.org/wiki/Longsword

      and weighing approximately 1 to 1.5 kg

      It’s close enough, I’d say. OP’s maths that is.

  • Onno (VK6FLAB)@lemmy.radio
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    6 months ago

    These are the required elements for making steel:

    • Iron
    • Carbon
    • Manganese
    • Chromium
    • Phosphorus
    • Sulphur
    • Nickel
    • Molybdenum
    • Titanium
    • Copper
    • Boron

    Source: https://www.cliftonsteel.com/education/11elementsfoundinsteel

    So, iron is only step 1. Humans are carbon based lifeforms, so I’m guessing that carbon is also sorted, that’s step 2.

    There’s plenty of other elements in the human body, like phosphorus and sulphur, but I’m guessing that it’s going to take more than 300 adults.

    Source: https://sciencenotes.org/elements-in-the-human-body-and-what-they-do/

    Source: https://sciencenotes.org/wp-content/uploads/2019/02/PeriodicTableHumanBody.png

    • general_kitten@sopuli.xyz
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      6 months ago

      Steel requires only iron and up to about 2% carbon

      Rest are minor alloying elements used mainly in modern steel alloys to improve the steel beyond what just carbon steel could do like for example stainless steels

    • sushibowl@feddit.nl
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      6 months ago
      1. Your link says these are elements commonly found in steel, not that they are all required. In fact it says of phosphorus and sulphur that they are generally undesirable.
      2. We don’t need to make a steel sword, an iron sword could do.

      Either way you would definitely need carbon, but as you say that’s pretty easy. I don’t think any of the other elements are absolutely required.

    • barsoap@lemm.ee
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      6 months ago

      You only need iron and carbon the rest is already alloyed steel. You can definitely make a good blade out of only iron and carbon, it won’t be stainless, it might be difficult to harden just right, but it will be flexible and hold a keen edge if forged right. The smiths of ole dealt with nastier steels containing all kinds of things making it worse, not better (such as excessive amounts of sulphur and phosphorus) so I’d say they’d manage.

    • ColeSloth@discuss.tchncs.de
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      6 months ago

      Those are all of them, but that’s for a lot of different types of steels. You don’t have to have all of those metals to make steel. You really just need iron and a tiny bit of carbon. A few of your ingredients help with purity, and the rest are additives for different steel properties you may want. Like a touch of nickel for stainless steel.

  • Mossy Feathers (They/Them)@pawb.social
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    6 months ago

    Listen. If they used surplus blood to do this (blood that was expired) and then held a raffle at the end of each year where all blood donors were entered to win a knife or sword made from the expired human blood iron, I bet they’d see blood donations skyrocket.