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Silica gel is a granular, vitreous, highly porous form of silica made synthetically from sodium silicate. Despite its name, silica gel is a solid.
Silica gel is most commonly encountered in everyday life as beads packed in a semi-permeable plastic. In this form, it is used as a desiccant to control local humidity in order to avoid spoilage or degradation of some goods. Because of poisonous dopants (see below) and their very high adsorption of moisture, silica gel packets usually bear warnings for the user not to eat the contents. If consumed, the pure silica gel is unlikely to cause acute or chronic illness, but would be problematic nonetheless. However, some packaged desiccants may include fungicide and/or pesticide poisons. Food-grade desiccant should not include any poisons which would cause long-term harm to humans if consumed in the quantities normally included with the items of food. A chemically similar substance with far greater porosity is aerogel.
From wikipedia:
I've heard piano stores may have extras that can be picked up cheaply. Note that silica gel must be "recharged" every onece in a while. You put it in the oven for a few hours to drive out any moisture, and then it's good to go suck up more moisture again.
I use it along with a goldenrod in the safe, and typically throw one in ammo cans to keep humidity low.
Durango, what is your source for cheap stuff?
A long time IF the seal is good and IF it was very dry when sealed. I've seen some come on the market that a percentage were not so well done, tarnished rounds and corrosion. The seller usually lets you know if its a major seller.I bought one of those spam cans. Does anyone know how well the ammo will keep if the can remains sealed?
buy a five pound bag of this
at Bimart for $5.99 on sale, put a hand full in nylon stockings, put in sealed ammo can and be done. You can get free nylon stockings at the Nordstrom women shoe department, just have your wife grap a hand full of the try-on stockings, so they don't think you are a cross dresser - not that there is anything wrong with cross-dressing.................
Enough silica in one bag for a lifetime.
this is the same thing but more $$
http://www.petco.com/Shop/AlternateImages.aspx?FamilyID=6678&sku=