Altitude will have effects on the speed the process takes. I wouldn't trust any outside source for CS, personally. I have bought and used "SilverSol" in the past, but I never ran tests and have long since thrown out any remaining stocks. I also wouldn't trust CS stored inside plastic bottles. Making your own may be safer, but it's your call. I can't tell anybody what they should do, except using the CS for topical purposes only. As for ingesting it, many have done it and report no problems, including myself. I think Melbo has taken it for years. Still, I am certain it's safe even though I cannot recommend ingesting it just as a disclaimer. Some companies, who have done more research into this than I have will report they have bonded the silver on a molecular level in a certain way, and there's a lot of scientific jargon describing why it's clear, but honestly I do not know. Perhaps they have a way to increase the efficacy of the colloidal and make the molecular bond different somehow. All I know is that the colloidal silver I make, and others here have found it turns golden after a few hours, and I know strong batches definitely turn black in sunlight. Allowing the final batch to sit for a few days and then filtering will produce a better product. The amber color may be from the molecular changes which occurred when the silver bonds with hydrogen and oxygen. Maybe the silver bonds with sodium chloride, or it's only a catalyst. I have no idea.