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"I'm strictly an ivory-tower person. I can explain things but I can't do things."
- Isaac Asimov

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.
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

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