That reddish glow looked like hydrogen ions in the air.
"The Black Star Passes" by John W Campbell
It forms hydrogen ions in solution and neutralizes bases forming salts.
"An Elementary Study of Chemistry" by William McPherson
The explanation probably lies in the degree to which the acid is split up into "ions" of hydrogen (H), and sulphate (SO4).
"The Automobile Storage Battery" by O. A. Witte
Before the zinc ions began to crowd in there were just enough hydrogen ions to go with the sulphate ions.
"Letters of a Radio-Engineer to His Son" by John Mills
The rays seem to be positive ions with masses never less than that of the hydrogen atom.
"A Brief Account of Radio-activity" by Francis Preston Venable
TABLE III: Individual contributions to the shielding constant σ × 106 for selected hydrogen-like ions.
QED calculation of the nuclear magnetic shielding for hydrogen-like ions
These might, for example, be hydrogen atoms (x = HI), metal ions (x = m), or dust grains (x = d).
A Global Perspective on Star Formation
Consider e.g. a hydrogenic ion with a large nuclear charge Z .
On Effective Field Theories at Finite Temperature
The study of the Lamb shift in the hydrogen atom and the helium ion about ﬁfty years ago led to a great development of Quantum electrodynamics.
Laser spectroscopy of simple atoms and precision tests of bound state QED
Above that range, ions are fully stripped, but hydrogen-like recombination emission is still possible.
X-ray Spectroscopy of Accretion Disks and Stellar Winds in X-Ray Binaries