Blue cheese is believed to have been discovered by accident, when cheeses were stored in naturally temperature and moisture controlled caves, which happened to be favourable environments for many varieties of harmless mold. Roquefort is mentioned in texts as far back as 79 AD. Gorgonzola is one of the oldest known blue cheeses, having been created around 879 AD, though it is said that it did not actually contain blue veins until around the 11th century. Stilton is a relatively new addition becoming popular sometime in the early 18th century.
Originally, when they made blue cheese, the cheese makers left old loaves of rye bread in the damp caves so that the mold would grow on the bread. The mold was then dried, ground and then mixed with the cheese curd in order to produce the blue cheese.
How do you store it? It is best to wrap blue cheese in tin foil with another layer of plastic wrap over the top. How do you know when Blue cheese has gone bad? Blue cheese has gone bad if it has an extra blanket of furry mold surrounding the cheese.