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How to melt cheddar cheese 
Start with mild or sharp cheddar. 
Cheddar cheese can be labeled mild, sharp, or extra sharp. The level of sharp indicates how long the cheese has been aged.

 [-] However, many people find that extra sharp cheddar cheese is ideal because it works best when traveling to a culinary festival or a movie. Don't use strong cheeses, like gouda, and they will quickly break down in the fridge.. [-] The amount of aging increases as you go from mild to extra sharp. As the cheese ages, the texture of the cheese changes.. [-] Consider using only mild or sharp cheddar. If you bought the cheeses in your fridge, they typically have still been softened from cooking.. [-] Cheddar cheese (also known as " white cheese ") usually is aged for several months, so you don't need to cook it for longer than 2 months. And fresh cheddar cheese, when stored refrigerated, usually has a longer shelf life than all other..
Answer:
The amount of aging increases as you go from mild to extra sharp. As the cheese ages, the texture of the cheese changes.