[Mike3527]

Hey guys. So I recently dis some research on how  to make home made hand warmers using iron powder, salt, cellulose, carbon and water. Is there anyway I can make this so the  oxidation reaction only  starts when I expose it to oxygen. I'm thinking I will have  to make it in a ziploc bag. Is  there anyway to make this hand warmer in a ziploc bag without it being exposed to oxygen

[billnotgatez]

Closed box with Argon?

I thought most hand warmers had to be crushed to activate, which implies that some of the chemicals are kept separate until use.

Does most water sources have dissolved oxygen?

[vmelkon]

Keep the water in a plastic bag. When the bag is squeezed, it blows and wets the iron.