I have some store bought Cold Mountain brand Koji rice. On the container it says it keeps in the fridge for "6-12 months". I've had it for about 8 months, but can detect no change from when I bought it by either sight (still white and chalky), touch (perfectly dry), or smell (not sour, a little sweet).
That said, this is a fungus we're dealing with, so I want to be sure I can still use it.
How can I tell if Koji rice is still good to use?