1, smell. The best way to judge whether the blue cheese has gone bad is to smell it. Fresh blue cheese has a strong smell, which will change with the gradual deterioration of cheese. Pick up the cheese and smell it. If it smells of ammonia, it may have gone bad.

2. Observe the color. Fresh blue cheese usually has blue or green mildew spots. However, you should pay attention to the solidified part of the cheese. Most of these parts are white, beige or yellow. If the condensed part begins to turn pink, brown or green, then this cheese may have gone bad.

3. Try it. If there is a piece of blue cheese with the same smell and color as when it is fresh, you can also taste the cheese to judge whether it has gone bad. Although the fresh blue cheese has a strong pungent smell, the old cheese that has begun to deteriorate has a disgusting smell. As long as you taste an unbearable taste, you have to throw away this cheese.