[link to theartofmakingcolloidalsilver.com (secure)]
Argyria is the graying of the skin. Colloidal silver can be produced either chemically or electrically. Argyria is a result of ingesting high doses of chemically produced colloidal silver. There has never been a case of Argyria caused by electrically produced colloidal silver.
Please be clear about this, electrically produced silver colloid does not cause Argyria. Hundreds of thousands of people worldwide have been taking electrically produced colloidal silver for decades. The concern is with silver salts, not colloidal silver.
[link to theartofmakingcolloidalsilver.com (secure)]
Chemically produced colloidal silver causes Argyria. Colloidal silver was widely used in the early 1900s. Scientists at the time discovered that if they chemically combined the silver colloid with a protein, it would not only be better digested, they could produce it in greater concentration.
This led to silver nitrate and silver salts. Before the early 1900s, there had never been any adverse side effects with ingesting silver, so testing the toxicity was not a big concern. But before the toxicity was tested, doctors had already begun to use it on their patients.
As we know now, silver nitrate and other silver salts were toxic in high doses. It caused Argyria, cosmetic bluing, or graying of the skin produced by a build-up of un-dissolved silver particles in the tissues.

The only effect reported by some colloidal silver users is a phenomenon called the “Herxheimer effect,” named after doctor Karl Herxheimer (who identified this phenomenon).
Sometimes, when taking colloidal silver for the first time, some people may experience mild headaches, cold, or flu. The reason is that colloidal silver is so efficient at killing pathogens that the body may not adequately dispose of the dead pathogens fast enough through the normal organs of elimination, and it resorts to the secondary ones, the lungs, sinuses, and skin.
The user may experience mild diarrhea as the body tries to flush itself out. In that case, one merely needs to reduce the dose or completely abstain for a day or so. Once the body has been thoroughly cleansed, these symptoms will not reappear.

Electrically produced colloidal silver is completely safe and non-toxic. There has never been a single case of Argyria caused by electrically generated silver colloids. Humans have consumed it for years without any adverse side effects.

Clear is good
A clear colloidal silver solution signifies that there is no agglomeration to form larger particles. Agglomeration means that some of the particles are starting to share electron rings and are no longer repelling each other. This, in turn, may render the colloidal silver less potent.