Does a clean, dirty/earthy smelling grain bag indicate no current contamination?
For context I inoculated 4 bags (for the first time ever) and I recently B&S just one of them. After a few days of no growth I decided to give the bag a squeeze and smell the GA area and noticed a fermented-ish smell. I then decided to do the same with the other three bags and they were all noticeably earthy/dirty smelling, no sour.
I’m wondering if the bag doesn’t smell contaminated, does that mean that it is Definitely clean? Or just probably clean? Or is it not a great indicator at all.
For example: if I move a clean dirty/earthy smelling grain bag to a tub and it ends up contaminated, can I be certain that the contam was introduced during/after it was moved to the tub?
All opinions and info is appreciated, thanks everyone