Yahweh#1, Using 20 ppm Colloidal Silver w/50% KARO and 50% DW made by the hot method!
Today I just used some 20 ppm colloidal silver. It looked exactly the same as when I had made it. I had stuck it on a shelf in my garage and had forgotten about. It was in an enclosed metal cabinet exposed to the changes of temperatures, (25F - 95f).
This was not the best thing to do but I'm thinking more of a what might happen in the future when you might need it. Wounds, strep throat, cat scratches and eating something not what I wouldn't call fresh cut meat and feeling somewhat nauseous afterward. So stop it in its tracts! This will have to be done when the powers to be kill our power structure and whittle down the population to a more manageable level.
And I always have 320 ppm made with 50/50 KARO/DW and capped with maltodextrin. This has a great number of uses you will find as you read this forum.
Plus don't forget all the medicinal uses you can get from litterly hundreds of over the counter natural herbs and spices such as teas, cinnamons, white willow. Borax, DE, coconut oil, jojoba oil, omega 3 and the list goes on and on. You need to stalk up and know.
All these things done with care and of course cleanliness and packaged right will last for years.
Good Luck, Bobby.