this post was submitted on 03 Jul 2025
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That time I smeared my blood on my biology notebook (lemmy.world)
submitted 15 hours ago by droning_in_my_ears@lemmy.world to c/casualconversation@piefed.social
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So back in highschool, the grade for 12th grade was based 100% on the mid and final exams. Homework didn't matter, quizzes didn't matter, projects didn't matter, participation in class didn't matter as far as grades go. You could of course still do these things and most people did care about them to practice but in the end it was all about the exam.

So I used to always take quizzes seriously as a chance to practice. I would note down my mistakes on my notebook IN ALL CAPS with red ink and a spiky border. Just so I don't make the same mistake again in the exam.

One day I made a mistake in a biology quiz because I confused heart pulse and blood pressure. That day I had cut myself and was bleeding. After writing the usual warning I looked at my hand and thought the blood matched the red ink really well...so I smeared my blood under the red ink warning.

After a few days the blood smear turned chocolate brown and no longer matched the warning :(

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[–] dohpaz42@lemmy.world 4 points 14 hours ago

And you learned something new and unexpected too. I doubt you’ll ever forget this lesson. 😊

[–] MentalEdge@sopuli.xyz 3 points 13 hours ago

Yeah. The red color is from the iron in our blood. As it dries, you get rust brown.

Because that's what it is. Iron oxide.