Visible mold that is not part of the cheese’s normal blue veining
Pink, orange, black, or fuzzy growth on the surface
Strong ammonia smell
Sour, rancid, or rotten odor
Slimy, sticky, or unusually wet texture
Dry, cracked, or excessively hard surface with off smell
Bitter, harsh, or unpleasant taste
Discoloration that looks unusual for blue cheese
Packaging that is swollen, leaking, or damaged
Mold spreading beyond the normal blue-green veins
Expired for a long time and showing any spoilage signs
Tastes or smells noticeably different from normal blue cheese