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Kiln dried lumber is lumber that has been heated in a kiln so that it has a low moisture content. View slideshow of images above.or some applications, lumber that has been kiln dried can be used just as it is. In other instances, it may be necessary for the lumber to acclimate for one to two weeks, and the wood may pick up some additional moisture during this time.
Freeze-Drying. Freeze-drying is a special form of drying that removes all moisture and tends to have less of an effect on a food's taste than normal dehydration does. In freeze-drying, food is frozen and placed in a strong vacuum. The water in the food then sublimates -- that is, it turns straight from ice into vapor. Freeze-drying is most commonly used to make instant coffee, but also works extremely well on fruits such as apples. You probably don't have a good vacuum chamber at home, but you almost certainly have a refrigerator. If you don't mind waiting a week, you can experiment with freeze-drying at home using your freezer.