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Lewis and James of Kodak Research Laboratories initiated the subject of Gas
Hypersensitization by using N2 to double the speed of 103a-o Plates.
Smith then baked the plates in presence of N2 and had a speed gain of five
with IIIa-j (also of Kodak Research Laboratories).
In 1974, Babcock et. al (also of Kodak Research Laboratories) announced
that the use of Hydrogen is superior to N2. This was verified at the University
of Florida with 103a-o and IIIa-j.
Due to the explosiveness of Hydrogen, several mixtures of Hydrogen and N2
were experimented with, and Forming gas at 92% hydrogen and 8% nitrogen was
found to be superior with IIIa-j Plates. Full exposure dropped from 5 hours to
22 minutes to attain the photographic speed point i.e. to raise the diffuse
density 0.6 above background fog.
This is all from "A.G. Smith "Hypersensitization and Testing of
Astronomical Plates for Threshold Imagery" APP. Phot. Eng., 3, 205 - 209
(1977).
Hope this helps. Sorry to be so anal retentive!
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