Hello! I'm new to the site. I've been into longterm food storage now for 2 years. My question was about pancake and biscuit mix ( I bought from Gordon Food Supply), I've got about 100 lbs. of both types of mix stored in 5 gallon food grade buckets with mylar bags and oxygen absorbers. I thought that both mixes would last at least 8 to 10 years in my storage, but recently read that baking soda has a shelf life of only one year- I would have to add more baking soda to the mixes to get the dough to rise? Has anyone else heard of this? Thank you.