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"Science fiction represents the modern heresy and the cutting edge of speculative imagination as it grapples with Mysterious Time---linear or non-linear time."
- Frank Herbert

Penetron  
  A synthetic substance that is opaque unless penetrated by infra-red.  

Within the orbed confines of the impermite dome were scattered blockhouses, cubed barracks built of penetron, the synthetic translucent substance that could be rendered transparent only by the infra-red beam of the dictator. Thus no smallest act of his subjects escaped his scrutiny; an invaluable deterrent to conspiracies.
Technovelgy from Redmask of the Outlands, by Nat Schachner.
Published by Astounding Science Fiction in 1934
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