Slimy or sticky texture
Strong sour, rotten, or off smell
Mold or visible fuzzy spots
Dark, mushy, or water-soaked areas
Severe wrinkling or shriveling
Yellowing or browning throughout
Soft, limp, or collapsing beans
Sour or unpleasant taste
Package is swollen, leaking, or damaged
Beans have been stored too long past freshness date