Loading ...“Expiration Dates” are mostly for marketing/inventory control. I would be willing to use silver sol with a 2018 Expiry yet. What happens to colloidal silver with age is that the particles lose their suspension charge, cluster up, and fall to the bottom of the container. How soon this happens depends a great deal upon the original ‘quality’ of the solution…. IE: The particle size. Smaller particles stay suspended longer. Chunky homemade silver solutions will fall out fairly quickly.
The surest way to know is with a PPM meter, dipped into the solution and read if it is 10 PPM yet. You can also ‘eyeball’ the solution to see if it still has the characteristic golden color, or you can shine a laser pointer thru the solution in a glass to observe the beam scattering brightness.
The reason I am a fan of American Biotech’s ASAP silver products is their proprietary process produces the finest particle size available. The result is a product that is both long lasting, and smaller particle size is more effective at killing small viral and bacterial cells.
As for the Silver Gel… I would ignore the expiry on that completely. Silver particles are not going to fall out of the gel base.