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"In WWII, they had a saying that there are no atheists in foxholes. I think the modern equivalent of that is that there are no jaded, bored people in the high-tech industry, in the land of really good hardcore geeks."
- Neal Stephenson

Tannin-Secretion Pills  
  Artificially darkens skin, for skin protection.  

All my life I've used tannin-secretion pills for protection against ultraviolet, so that my skin color has varied from its normal pinkish-white (I'm an albino) to (under blue-white stars) tuxedo black.
Technovelgy from Crashlander, by Larry Niven.
Published by Del Rey in 1994
Additional resources -

Compare to selected melanin boosting from Neuromancer by William Gibson.

Thanks to Ted Ewan for contributing the quote.

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Additional resources:
  More Ideas and Technology from Crashlander
  More Ideas and Technology by Larry Niven
  Tech news articles related to Crashlander
  Tech news articles related to works by Larry Niven

Tannin-Secretion Pills-related news articles:
  - Drug Creates Real Melanin Tan

Articles related to Medical
MouthPad Supports Head And Tongue Tracking
Drug Induces Hibernation-Like State In Humans
Drug To Regenerate Teeth In Humans
Illustrating Classic Heinlein With AI

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