Freezer burn

Freezer burn happens when the outside of a food loses so much moisture that it essentially becomes freeze dried. Although freezer burn is not harmful, it does make food taste dull and unpleasant.

Beware of Freezer Burn When Freezing Meats
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One of the biggest challenges people encounter when freezing food, is freezer burn. Freezer burn occurs as a result of dehydration and oxidation. When air reaches the frozen food it will develop freezer burn.

Freezer Burn - A loss of moisture in foods when improperly wrapped before freezing. Freezer burn affects both the texture and flavor of food, and is evidenced by dry patches which may be whitish or grayish in color.

Freezer burn (food industry term):
The loss of moisture that affects frozen food. The white or gray spots caused by improper packing or food handling.
Freezer Burn: ...

Air and moisture are the two main elements that cause freezer burn, likewise freezer storage containers and wraps must be moisture proof and airtight.

Most books on ice cream suffer from freezer burn, offering loads of recipes but little explanation or, well, fun.

Simply wash them, core them, then cut them into pieces; freeze in a single layer and transfer to an appropriate freezer container, eliminating as much air as possible to minimize freezer burn. Use frozen vegetables within eight months.

See also: Freeze, Cooking, Frozen, Sauce, Water