true Colloidal Silver is made with direct high voltage AC current. now if you use this technique, with an airpump. you get clear tasteless, silver. use the tyndall effect. you will see a very slight red beam. go about 5ppm thats all you need. never ingest yellow, Colloidal Silver has to be Crystal C., and tasteless. with a tyndall effect. use AC only, and be careful. its very dangerous. you are talking AC high voltage. dont touch the electrodes if plugged in.