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You might consider adding luminol to the creatures' bloodstreams. When mixed with an oxidizer (like oxygen) and a catalyst, it becomes luminescent. It turns out that the iron in hemoglobin is a ver...
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#1: Attribution notice removed
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System
·
2020-06-01T14:13:53Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/95404 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/