The type of mould that makes a blue cheese blue is different from the type of mould you will find in a lump of Gouda left in your fridge for too long.
Some mushrooms are safe to eat, while others are hugely dangerous and will kill you if you eat them – mould is the same. Blue cheese is made in such a way as to grow certain types of good mould, while the stuff that appears naturally in your fridge is the bad stuff that can make you ill.
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