Its possible the author of that linked article is unaware of some simple and inexpensive ways to make nanoparticles of silver

"To make a true colloid is a complicated, complex, and costly process"

It appears you can brew some tea and mix it with the silver we might make electrolytically and presto!

"The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of silver nanoparticles (Ag NPs) was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized Ag NPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) Ag NPs, capped with poly-tannic acid"

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8071046/




On 9/7/2021 9:13 AM, Phil Morrison wrote:
I note that the pseudo-scientists are back again on this Forum promoting ionic over colloidal silver.

Well, as I have argued on this Forum several times, only colloidal silver NPs kill pathogens efficiently.  NOT ionic silver.

Please read the article below to put the matter to rest for all time.

https://www.silver-colloids.com/about-ionic-silver/ <https://www.silver-colloids.com/about-ionic-silver/>