[gmikol]

Also, assuming you have "completely" dehydrated a tissue, how long would it take to acclimate to the ambient moisture? Couple minutes, an hour or two, ...?

I would guess it would be on the order of hours. Might depend on how hygroscopic your additives are. If you had an analytical balance, you could completely dry the tissue, weigh it dry, and then monitor it's weight over time and see for yourself. Balance would probably need to be sub-milligram accurate.

This is just conjecture on my part, but I suspect it would be quicker to drive a tissue with excess moisture to equilibrium than a completely dry tissue to the same equilibrium point. Since heat could be used with a damp tissue to drive water from the tissue, but I'm not sure that a warm environment could be used to drive moisture into the tissue.

Did I catch a pun in there... sweet spot and sucrose?

NO...I only use glycerin, no sugar.

--Greg