This method is depending on the ultraviolet in the sunlight to reduce the
silver compounds, causing them to become either colloid or precipitate out
leaving only colloidal silver.  Interesting idea, but one should make sure
and not use glass containers for this since glass blocks uv rays.  Quartz
glass or clear plastic should be ok though.

Marshall

"Jonathan B. Britten" wrote:

> If this is correct, it might have a useful emergency application:  one
> could make large quantities of EIS using any available water source,
> put the product in clear containers, leave the containers in the sun,
> and carefully decant the EIS after several days.
>
> BTW, the sunlight method alone can purify contaminated water in 48
> hours, or so I read.
>
> JBB
>
> On Friday, Feb 24, 2006, at 01:39 Asia/Tokyo, Marshall Dudley wrote:
>
> > They have it backwards, sunlight reduces
> > (deoxidizes) silver compounds to produce silver particles.
>
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