How can rice flower kept fresh for a long time.Do I need to add chemicalls and in what propotion?

Do not add chemicals.


Wrap tightly so there is no air exchange.


It can be frozen, tightly sealed.


It can be kept at room temperature if it is tightly sealed.


I could be refrigerated., again tightly sealed.

How can rice flower kept fresh for a long time.Do I need to add chemicalls and in what propotion?
Just buy small amounts, since the quality will go down over time, no matter how you store it.