Joe, Re: Coffee filters
What you are dealing with (Cs) is a very pure solution, in the
parts per million, so it takes little contaminate to modify it!
I have Brew Rite brand coffee filters (made by Rocklite Inc.)
and one filter will add 35PPM of crud to an ounce of pure
water! If used with perfect Cs it makes 5PPM change to
20+PPM and it TURNS DARK IN THE SUNLIGHT in 15
minutes, indicating the formation of silver salts! So many
on the list say there are "good" coffee filters that I borrowed
some from friends and they all were lousy! Interestingly,
some of the same brand were much better then mine (12PPM)
and the quality of the paper looked better - guess they buy paper
from different sources, so there can not be a standard quality!
The point is that if you start with 5PPM and add 5+PPM of crud
(binders, clay, etc. in the paper) you windup with silver salts,
which are mostly poorly soluble and thus little value. Your
body chemistry can breakdown soluble salts such as silver
nitrate, to use the silver ions, but the nitrates are bad news!
So, not knowing the chemistry of what you made can be risky!
What you can do (if you have measuring means) is wash a
coffee filter 4 or more times in pure water (one took 10 washings),
until the crud is washed out, and then use it until it clogs!
I put a coffee filter in 2 ounces of DW and shake it up well, dump
out the water and repeat, until it adds less the 0.25PPM, before I
will use one.
P.S. No Bob, good stuff will not darken in sunlight, even strong UV
for weeks, but contaminate it, to form salts and it will! Those that
insist on colored bottles are suffering from a case of the "salts"!
[email protected]
Joe said:
Re: "... wash a new coffee filter in it..." Based on past postings
wih this group, I thought a coffee filter was a perfectly safe method
for filtering out any larger, argyria-causing, silver particles and
precipitates. Now, I see that doing this can ADD contaminants, even
argyria causing contaminants? Joe G.
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