|Purred: Sat Jul 13, '13 4:33pm PST |
|Here is is copy and paste from another site about colloidal silver:
"There are three distinctly different types of silver that are labeled and sold on the market as “colloidal silver”; they are ionic silver, silver protein, and true colloidal silver. Commercial Product Reports provide detailed laboratory analysis of colloidal products. Scientific product testing performed by CSL is an unbiased examination of the physical properties of colloids using the best scientific methods and equipment available. The instruments used to perform the tests are described in detail and the test methods are fully revealed so that the entire suite of product tests can be duplicated by others. Before exploring the reports, charts, graphs, and details of the tests, it is important to have a basic understanding of the three types of products that are marketed as Colloidal Silver. The three types of products that consumers find labeled as “colloidal silver” can be categorized as follows: ionic silver solutions , silver protein, and true colloidal silver. The vast majority of products labeled and sold as colloidal silver fall into this category due to the low degree of manufacturing complexity and resulting low cost of production. Confusingly, ads for these products frequently claim that silver ions are small silver particles or describe the product as consisting of ionic silver particles. Silver solutions are typically clear like water or have a slight yellow tint. Companies that sell ionic silver claim that their product is "true colloidal silver" in an attempt to confuse the buyer. Many producers of ionic silver recommend that the product be stored only in glass containers. To figure out whether a solution is ionic silver, you only need add chloride ions. The difference between silver ions and silver particles boils down to the fact that silver ions combine with chloride ions to form silver chloride and silver particles do not. “Colloidal silver” generators sold to home hobbyists all produce ionic silver solutions. Ionic silver products, when taken according to the manufacturers recommended dosage, will not cause argyria, a condition that causes the skin to turn blue-gray. The term colloidal means particles not ions, but producers of ionic silver products will try to convince the buyer that their product is a silver colloid. Silver protein products are the second most prevalent type of so-called colloidal silver products on the market. Most products claiming to be high concentrations of colloidal silver (typically in the range of 30 to 20,000 ppm) are in fact silver protein colloids. Silver protein products generally have very large silver particles, so large that they would not remain suspended as colloidal particles without protein additives. Of the three types of colloidal silver, silver protein products have the lowest particle surface area for a given silver concentration , making the silver inaccessible for safe human absorption and less effective for human use. When shaken, a silver protein product produces foam above the liquid that will persist for minutes after being shaken. Silver protein products tend to have very high concentration values, typically in the range of 30 to 20,000 ppm.The color ranges from light amber to almost black with an increasing concentration of silver. •Due to the high concentration of large silver particles, silver protein products are known to cause argyria, a condition that causes the skin to turn blue-gray. •Adding protein to colloidal silver is also potentially unsafe because of bacteria, according to Professor Ronald Gibbs who discussed this fact in his booklet " Silver Colloids". True colloidal silver products are the least prevalent type of colloidal silver on the market due to high degree of manufacturing complexity and the resulting high cost of production. In true colloidal silver, the majority of the silver content is in the form of silver particles.The two critical factors to look for in determining true colloids are the percentage of silver particles and the particle surface area. Of all the types of silver marketed as colloidal, true colloidal silver products have the highest particle surface area. The nanometer-sized particles in true silver colloids remain in colloidal suspension without requiring protein or other additives. Because of the high concentration of silver particles, true silver colloids are never clear like water. Due to the very low concentration of ionic silver and small particle size, true silver colloids do not cause argyria, a condition that causes the skin to turn blue-gray. The effectiveness of a colloid is predicated on particle surface area, therefore particle surface area is the single most important metric for comparing colloidal products. In the booklet "Silver Colloids" Professor Ronald Gibbs wrote "The size of the particles in the colloidal silver suspensions we use for health purposes is very important." In this context, effectiveness is defined as the ability of the colloid to interact with its environment , just as in the world of chemistry, where surface area determines how well substances react with one another. Effectiveness of a colloid is determined by the particle surface area making it the single most important metric for comparing colloids. It seems clear that some companies are not properly measuring the silver concentration in their products. Accurate determination of silver concentration requires the use of either an atomic absorption/emission spectrometer or a mass spectrometer. When an FDA laboratory determines metal concentration they use either and ICP/AES or an ICP/MS whose readings will match very closely the values that are indicated on the lab analysis pages. Ionic silver products which have a low silver concentration while at the same time have high electrical conductivity will generally have a low pH value (acidic). High values of electrical conductivity - ionic silver products that do not contain nitrate or some other form of contamination will typically have a conductivity reading expressed in micro-Siemens (uS/cm) that is approximately equal to the silver ion concentration in ppm. Low pH values - pH values below 7 are acidic, values above 7 are basic and exactly 7.0 is neutral. 3.No silver particles present - nitric acid will dissolve silver particles so no silver particles will be present in products that contain nitric acid. Presence of nitrate (NO3) - When a nitrate determination has been made for a given product the value of NO3 expressed in parts-per-million (ppm) of nitrate will be included on the lab analysis page. At the moment, not all lab analysis pages have nitrate test values shown.Not a single lab analysis has been disputed as of this date, and manufacturers cannot claim ignorance about the contents of the products they are selling."
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