Mike, I wasn't a member of the silver list when you were last. But I would like to bid you a welcome back. While you were away, the subject of making concentrated EIS came up and I was wondering if you would have any thought or insights on the subject. It started with the following link where there is a method claimed to be able to make EIS as high as 500 ppm. It is of course a very dark color but it is also claimed that when sufficiently diluted, it will return to a light yellow color.( I would assume that at that point you could add a little H2O2 to produce a clear solution.) See:
http://www.silverceramicsystems.com/CS16-5-3.html Recent Success at Concentrated CS Production Points Up Requirement of Very Pure, Distilled Water Then a silver list member mentioned a method he had developed to make concentrated EIS that seems to support the process in the link above using high temperatures to make a concentrated EIS. His comment: "I have concentrated EIS by putting it in a coffee carafe and putting it on the coffee maker hot plate. When it steams off about half of the water I refill it and repeat until the solution turns a dark gold to brown appearance. At that point if you add the same amount of distilled water as you reduced the solution will turn back to clear. So I would think you could reduce even farther and reconstitute it with distilled water from any concentration if you keep in mind the amount you removed." Marshall contributed an insightful analysis of how such a highly concentrated, yet reconstitutable, EIS might be possible: "That fellow used to be a member of this list. We all assisted him ( made suggestions ) on his silver impregnated filtering clay. Anyway, the page is very interesting. First from reading it it appears that one could use high quality distilled water for both the double boiler and colloid water. Realizing that this is for areas where labor is cheap, and equipment expensive, there are a number of ways one could reduce the energy requirements, water requirements and labor requirements. 1. Use a timer to switch polarity as I presently do with my flow through system 2. Use a thermistor and temperature controller to maintain the desired temperature of the colloid without using a double boiler arrangement (a thermometer and a temperature controlled heating base could do it.) That said, I think I do understand what is happening. Our limit of 20 ppm, which includes the ionic silver primarily, is set by the solubility of the ionic silver at room temperature. Since that arrangement is heating the solution then two things happen. First the solubility of the silver oxide goes up significantly, from about 13 ppm to over 50 ppm. In addition the Browning movement will increase tremendously. Now if you increase the ion concentration, the probability of a collision between oxide or hydroxide silver ions increases by the square, so that alone should cause the colloidal portion to go up by a factor of about 20 to 25, setting the limit to about 400 to 500 ppm. The increase in Browning movement adds to this ability, especially of an ion and colloidal particle banging into each other. Not limiting the current also adds to the particle size thereby allowing a higher silver concentration. Now the colloid turns red. That indicates that the particle size of the colloid is much higher than optimum. Thus far it all makes pretty good sense. However they say that if you dilute it down to 20 ppm or so, it returns back to a light yellow, indicating small near optimum particle size. That does not make sense to me. I only have one theory as to how that is even possible. This is just a theory, and it could well be very very wrong. At the increased concentration and temperature, we end up with silver oxide and/or silver hydroxide ions colliding with silver particles, and they "stick" together. Once this happens, another silver particle can collide with the ion stuck to the first silver particle, making two particle stuck together with an oxygen or hydroxyl ion. This produces what appears to be a larger silver particle, although it is really made up of smaller particles stuck together by an oxygen or hydroxyl ions. Think of a popcorn ball, where the popcorn is the silver particles, and the sugar is the oxygen or hydroxide ions. Now, this is a stable arrangement, since the solution is at the solubility limit of silver oxide/hydroxide. However if you dilute it, the silver oxide/hydroxide "glue" dissolves back into the water, unglueing the silver particles, which are now small. Thus it will reconstitute back to good, but not necessarily excellent EIS equivalent." I am embarrassed to say that I have not yet tried to verify the process. I have a manual EIS generator without polarity switching and have not put together a switching circuit. Nor have I found someone to do it manually for me at a price I was willing to pay. :-) Rather than the setup described in the link or a coffee maker hot plate, my thought is to eventually try using an older crockpot where the temperature is designed to stay in the 180 - 200 degree range. (Newer crockpots have higher wattage heaters and will boil the water.) Anyway, any thoughts you may have are appreciated. Thanks, Steve N -- The Silver List is a moderated forum for discussing Colloidal Silver. Instructions for unsubscribing are posted at: http://silverlist.org To post, address your message to: silver-list@eskimo.com Address Off-Topic messages to: silver-off-topic-l...@eskimo.com The Silver List and Off Topic List archives are currently down... List maintainer: Mike Devour <mdev...@eskimo.com>
