this post was submitted on 30 Aug 2024
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Wow, cool! I had never thought about it, but it certainly makes sense you'd need blood in those dishes to get certain things to grow.
There are a ton of them, though I've only seen about a half dozen of these. Wikipedia has a nice list of what they are and what they're used for.
There are even contests for agar art.
"The Battle of Winter and Spring," ASM's 2018 Agar Art Contest first-place winner, by Ana Tsitsishvili, Undergraduate Student, Agricultural University of Georgia, Tbilisi, Georgia.
ELI5 video how it's made