I have frozen a clear sample quantity of home produced EIS, and then thawed it...Below are the results...
13.5 uS going into the freezer.
After frozen and thawed enough to get enough liquid to measure, it measured 3.2 uS - no observable settlement or anything else. The more it thawed to room temperature the higher the reading went.
Completely thawed and at room temperature it measured 13.3 uS.
The only consideration which need be given here is that the room temperature would not have been *exactly* the same after time thawing as when sample went into the freezer.
If any of those Ag+ ions agglomerated or fell out of solution it failed to show on the meter and it failed to be observable in the bottom of the sample vessel!
That should put paid to any myth that EIS is affected by temperature. That 2.2 uS difference would be because of water temperature variable after air conditioning had been turned on which lowered room temperature!
Shop bought products may have issues due to their purported high particle content, but properly produced home made predominantly ionic silver solutions will not degrade in cold weather!