What causes freezer-burn, and once something has it, is there any way to counteract it?

Freezer burn is the outcome of frozen food losing its moisture as a result of poor wrapping. Food that has freezer burn is safe to eat, but you may find the texture and taste not to your liking. To prevent it, make sure youo wrap the food adequetly.

Freezer burn is a condition that occurs when frozen food has dried out due to poor packaging.

Freezer burn often results in change of texture and discoloration of the affected food. It appears as grayish to brown leathery spots on the food, resulting from chemical changes in the food's pigment.

Although freezer burn affects the quality of food, it does not make the food unsafe or unhealthy to eat. It produces dry spots, which can be cut away either before or after cooking. Heavily freezer-burned foods may lose their flavor entirely.

Sadly, once the damage is done, you can't undo it.

Freezer burn is also an oxymoron.

Freezer burn is the result of ice crystals forming in frozen foods and interacting with cold air to dry out the product, basically the reverse of freeze drying. To prevent freezer burn, you need to ensure that the food items you are freezing are in air-tight containers, so as to prevent any moisture from acumulating.

To prevent it put your stuff in freezer bags and squish out the air.

I don't think so Throw it away. And use freezer bags.

I don't know what causes it, maybe cold air?? But I have never been able to make it go away.

I like your avitar! Looks like mine! ;-)