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"Science fiction has gotten more accurate as we've gotten closer to the present, because science fiction stories have not only attracted, but also generated current scientists."
- Larry Niven

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

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Science Fiction in the News

Bone-Building Drug Evenity Approved
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'Try to find out how he ticks...'

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'The greatest problem of all was the elimination of the human element of braking together with its inevitable time lag.'

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'Across the ancient sea floor a dozen tall, blue-sailed Martian sand ships floated, like blue smoke.'

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'Power could be compressed thus into an inch-square cube of what looked like blue-white ice'

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