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"I prefer working by artificial light."
- Isaac Asimov

Ultron  
  Very handy material is invisible and non-reflective.  

Ultron is a solid of great molecular density and moderate elasticity, which has the property of being 100 percent conductive to those pulsations known as light, electricity and heat. Since it is completely permeable to light vibrations, it is therefore absolutely invisible and non-reflective. Its magnetic response is almost, but not quite, 100 percent also. It is therefore very heavy under normal conditions but extremely responsive to the repellor anti-gravity rays, such as the Hans use as "legs" for their airships.
Technovelgy from Armageddon: 2419 A.D., by Philip Frances Nowlan.
Published by Amazing Stories in 1928
Additional resources -

If only we knew more about ultron:

I visited the plants where ultronic vibrations were isolated from the ether and through slow processes built up into subelectronic, electronic and atomic forms into the two great synthetic elements, ultron and inertron. I learned something, superficially at least, of the processes of combined chemical and mechanical action through which were produced the various forms of synthetic cloth.

It's primary use is in ultron wire.

Compare to herculoy from The Howling Bounders (1949) by Jack Vance, permalloy from Fugitives From Earth (1939) by Nelson S. Bond, magnalloy from The Cave of Horror (1930) by S.P. Meek, helio-beryllium from Out Around Rigel (1931) by Robert H. Wilson, steelonium from Ralph 124c 41 + (1911) by Hugo Gernsback and plasteel from Dune (1965) by Frank Herbert.

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Additional resources:
  More Ideas and Technology from Armageddon: 2419 A.D.
  More Ideas and Technology by Philip Frances Nowlan
  Tech news articles related to Armageddon: 2419 A.D.
  Tech news articles related to works by Philip Frances Nowlan

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