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Most experts agree that there are three determinants of colloidal silver quality.
For many years and yet today, most colloidal silver has been made using low voltage DC current. This low concentration optimizes the other two quality determinants, namely particle size and stability. If there is too much concentration, there will be more fall out and therefore a shorter shelf life. Also in the HVAC process, stability is very good since a uniform and strong charge is imparted to each particle. In fact, samples of HVAC colloidal silver made in 1995 show no signs of change in any of the quality determinants.