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2-bn-year-old rock harbors living microbes, rewrites life's history
(interestingengineering.com)
this post was submitted on 08 Oct 2024
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"Stain" doesn't need to apply to the human visible spectrum of light
It’s usually used for something that changes the superficial appearance of a thing without changing or obsuring its structure—and in this context it seems to mean making the DNA more detectable (by whatever means). I’m not picturing how this “dye” could do both those things at once on that scale.
I don't know. It's a common practice though just look it up
https://microbeonline.com/types-of-staining-techniques-used-in-microbiology-and-their-applications/