Ref: http://escribe.com/health/thesilverlist/m59103.html
> CS>Re: Current limiting by low range setting of RS "true rms" DVM's
> From: jrowland
> Date: Sun, 18 May 2003 02:15:30
>> As far as using coins to make cs, they are difficult to mount,
>> soldering may increase the risk of contaminating the cs with lead
>> or copper, it is difficult to get uniform current on both sides
>> of the coin so you lose effective wetted area, and they are quite
>> small.
> An alligator clip grasps my inch and a half diameter, 1/8" thick
> .999 silver coin firmly at its edge, allowing maximum wetted area.
> jr
The wetted area is
A = pi * (0.75^2) = 1.767 sq. in.
An alligator clip may contain copper or other toxic materials. So
you lose some area since you must leave room for the clip.
Say you get 1.5 square inches of wetted area. This is the same as 6
inches of 12 ga. silver wire, which has an area of 0.25 sq. in. per
inch:
A = pi * d
= pi * 0.080
= 0.251 sq. in.
Monsterslayer sells 0.999 fine 12 ga. silver wire in 3 ft lengths
for about $10 USD:
www.monsterslayer.com/CatalogIndex.htm
This is the same surface area as 6 Canadian dollars. According to
http://www.xe.com/ucc/, $30 Canadian = $21.95 USD
So with the coins, you are paying twice as much for silver as you
need to.
You can bend wire into a "W" and increase the wetted area. This
reduces the current density and produces better cs. With the coin,
you are stuck with 1.5 sq. in. wetted area. You would have to reduce
the current by a factor of three to obtain the same current density
as you could with 12 ga. wire. This would increase the brew time by
a factor of three.
The wire is 0.999 fine, and the coin is 0.9999 fine. Numerous posts
in the archive show the extra decimal place doesn't reduce the level
of contamination significantly. You still have contamination from
the distilled water.
The following is copied from "A Closer Look At Colloidal Silver", By
Peter A. Lindemann, http://www.elixa.com/silver/lindmn.htm
--------------------------------------------------------------------
Purity of Silver
The quality of your finished product depends entirely on the purity
of the water you start with and the purity of the silver you start
with. Most of the current literature suggests that only 99.9999%
pure silver can be used. Most home brew systems use 99.9% pure
silver. So, what is the difference?
To find out, I contacted Academy Metals, a company in Albuquerque,
New Mexico, that produces commercial silver. The total allowable
impurities in 99.9% (.999 fine) silver is 1000 ppm or 1 part in
1000. These impurities and their maximums are 1) Copper, 800 ppm, 2)
Lead, 250 ppm, 3) Iron, 200 ppm, and 4) Bismuth, 10 ppm. This
product is readily available in wire form and costs about $3.00
above the market (spot) price of silver.
When this product is used to make electro-colloidal silver at a
concentration of 5 ppm, the total impurities from the silver drop to
4 ppb (parts per billion) copper, 1.25 ppb lead, 1 ppb iron,.05 ppb
bismuth. With all allowable impurities at these low levels, there is
a reasonable argument for not being concerned. Still, sometimes
small things make a big difference. 99.99% silver (.9999 fine) has
total allowable impurities of 100 ppm of the same metals in the same
ratios, and costs (in wire form) between $50-$90 above the spot
price of silver. 99.999% silver (.99999 fine) has total allowable
impurities of 10 ppm, and in wire form costs about $250 above the
spot price. 99.9999% silver, in wire form, costs more than gold and
is very difficult to find commercially.
In one sample of 10 ppm colloidal silver we sent out for total
analysis (made with 99.9% silver electrodes), the primary impurities
found were: 1) Sodium, 470 ppb, 2) Calcium, 260 ppb, 3) Manganese,
70 ppb, 4) Potassium, 50 ppb, and 5) Magnesium, 24 ppb.
Since none of these impurities could have come from the silver, it
suggests that the purity of the water should be of greater concern
to the person making their own colloidal silver, than spending extra
money on purer silver.
--------------------------------------------------------------------
If you do get water that is pure enough to reduce the level of
contamination significantly, it won't conduct electricity. So you
have to accept some level of contaminant to start the process.
As far as I can determine, no one has offered any evidence this can
be harmful. Certainly, ordinary tap water is much worse.
So I'd use the coins to buy 12 ga. silver wire and some reasonable
quality distilled water.
Best Regards,
Mike Monett
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