Josephine, The 250 ppm that you have is a silver protein and not colloidal silver. It is very unusual to find a true CS over about 20 ppm.
Most people make a water clear CS that ranges from about 5 to 15 ppm. Unfortunately none of them have a true measuring instrument, so they guess at what they have with a Hanna meter. It will work well enough after one has a stabilized process and have correlated with standard means of testing so that they can get a feel of what they have. "Ole Bob" -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
