Loading ...You piqued my curiosity. I found my open bottle of ASAP10 and was shocked to find the expiration date was 2014 ! Still has the mild golden color and tastes normal. I rarely use it for nasal and throat spray “as needed”. Curious… I dug into my lab gear and got my TDS meter out. (Total Dissolved Solids). This little electronic wand probe gives a direct readout of 06 ppm on my silver sol…. six years after expiration. So it still has 60% of it’s original 10ppm strength. It still works fine… but you can use a little more as it ages.
DISCLAIMER: This measurement was made on ASAP10 silver solution. It will likely NOT apply to other brands or types of silver solution.