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What worries me about the bromothymol blue proposal is that it doesn't appear to be an organic chemical, i.e. no living organism produces it. This means that it's not possible (or at least unlikely...
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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/94206 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/