I purchased a large package of instant dry yeast and keep it in the fridge, in a mason jar. It lasts essentially indefinitely (I've had it for _years_.) Part o

I purchased a large package of instant dry yeast and keep it in the fridge, in a mason jar. It lasts essentially indefinitely (I've had it for _years_.) Part of the reason it's hard to use chemical leaveners in breads is that they only provide so much lift. A yeasted bread can go through multiple proofings and risings.