I'm not talking about cheap silver/metal mixes and MIS-use.
All cases of Argyria (Which are all old as it really doesn't happen anymore - people are smarter...) boil down to chinsy preprarers and abuse by users - right [colloidal] silver used right is harmless....
As for half-asses and people who intentionally abuse a thing - who can bother about that?
Millions of users with no argyria can't be wrong....1 or 2 less fortunate folks, well ok, what other thing can you offer besides water that actually has the REAL safety rates of CS? That's what I mean about wive's tales - they are usually not the real or whole truth....
And the real moral of the story is
1) Don't deal with chinsy or half-assed people and
2) Follow directions and abuse nothing to your own harm!
That's pretty simple common sense!
...And the benefit (if it works) is virtually contaminant free growing. I have more concern for the environment if it works than worry for people eating the mushrooms! There wouldn't be any problem with that at all.
You take a small problem among charlatans and abusers and make it seem like that is the reality when it's not. But real sensational sounding though!
And the guy is just doing an experiment to see - try to keep your hair on until we know about this and then you can be president of the alarmist group who doesn't like it -
I really want to know if it will kill psybe and other beneficial fungi, because I already know it kills fungi we don't want but that does not necessarily mean it will kill others...
I am sitting next to a 10 year colloidial silver drinker right this second, and there ain't a blue thing on her (or any of us either)
It has saved fruit trees, birds, dogs, cats and humans for us....it really is good stuff made and used RIGHT.

Wilma (next to me) just said "Gawd! If it was bad for you I'd be dead!"

I can add this if it is any comfort....In emergency cases of gangerous infections, canine parvovirus and limb threatening bacterial infections from deep wounds in ANIMALS, I have used concentrations and doses that were extremely high (50 times the highest human dose I have used?) and niether their eyes nor arses turned a bit blue, BUT consider that these also had physician and student/intern continuous care and fluid support, which I believe to be a contributing risk factor in potential argyria - dehydration, even at the regular level most people walk around with. ALL caregivers use Extra Fluids wherever they use silver - even if it's just in burn cream for topical application.
Whew! Ok - lecture over - sorry to go on....