While many find that Silver Hydrosol isn't as effective as Ionic Silver and that research has continually found that among the colloidal silver forms, the ionic silver atoms are the most powerfull at destroying pathogens, I did find this paper on Silver Hydrosol. The NASA mention is interesting and while in certain terms this paper may be outdated, it still reveals that Silver Hydrosol has pathogen killing behavior, and in this report one product is labeled as being 95% by volume active. :
"Rentz, (published 2003) reported a convincing retrospective, peer-reviewed treatise on a highly advanced, effective and safe virotoxic oligodynamic silver (Ag+) hydrosol, making the case that it is the agent of choice to combat SARS.1 The works of Goetz (1940),2 Berger et al (1976),3 Simonetti et al (1992),4 Russel et al (1994),5 and Crocker and Grier (1998)6 collectively established that electrolytically produced oligodynamic Ag+ hydrosol provides the ideal speciation of bioactive Ag+ completely harmless to mammals in contrast to other colloidal silver or silver salt speciationsa that are predominantly inactive and potentially toxic to mammals. They also established that oligodynamic Ag+ hydrosol possesses fabulous virotoxic properties. Comprehensive studies conducted by NASA (circa 1970) on a crude oligodynamic Ag+ hydrosol preparation offer a compelling argument that today’s highly advanced oligodynamic Ag+ hydrosols may be the solution to lessening the impact of viral plagues.
With today’s advancement in Ag+ processing technology, at least one commercially available, cost-effective oligodynamic Ag+ hydrosol is (a) proven to be over 95% bioactive per volume, with (b) an unprecedented surface area of activity (i.e., ≥ 6 km2 per gram Ag), that provides (c) an ideal concentration factor of < 25 ppm, in (d) an ideal liquid medium. CONCLUSION: The pharmacology of advanced oligodynamic Ag+ hydrosol shows great promise to easily overwhelm key defensive mechanisms of URTI resistance in general, including H5N1. Additional clinical studies are warranted to further demonstrate the efficacy and compatibility of per os virotoxic oligodynamic Ag+ hydrosol, as well as investigational intravenous and nebulized (aerosol) protocols."