Silica is great for removing humidity from air. But what I want is to remove oxygen from air, so my food stays fresh longer. Any clean and easy to use substance/method for that purpose?
replies(3):
https://radiolab.org/podcast/forever-fresh
Tldr: those plastic bags that salads come in are WAY more interesting than you think. They're selectively permeable membranes that only allow certain gasses in/out.