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"Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today -- but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all."
- Isaac Asimov

Dermal Spray  
  A color coating for the skin, applied as a jet of vapor.  

Kneeling down, Parsons opened his instrument case. As quickly as possible he laid down his dermal sprays. Wade and the others watched for a few moments...

The door opened suddenly. A woman entered... At the sight of Parsons she stopped. "Oh," she gasped. Her dark eyes widened in astonishment... "Why is your skin chalk-colored?" she asked...

"In my times," he said with difficulty, "we were divided into white, yell, brown, black races..."

"Why are you opening those tubes?"

"He's spraying himself," Wade said. "Darker."

From Dr. Futurity, by Philip K. Dick.
Published by Ace Books in 1960
Additional resources -

I don't know when people started using dermal sprays; I'm betting it was later than this book. Take a look at this video of modern-day spray tanning.

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Additional resources:
  More Ideas and Technology from Dr. Futurity
  More Ideas and Technology by Philip K. Dick
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