Woman's Institute Library of Cookery. Volume 5: Fruit and Fruit Desserts; Canning and Drying; Jelly Making, Preserving and Pickling; Confections; Beverages; the Planning of Meals

by Woman's Institute of Domestic Arts and Sciences

PRINCIPLES OF DRYING

108. DRYING consists in removing the moisture contained in foods by evaporation and thus rendering them less susceptible to the attacks of undesirable bacteria. Dried foods, as foods so treated are called, will not replace fresh or canned foods. However, they are valuable in many cases and possess some advantages over such foods. For example, the weight of dried foods is very greatly reduced, the storage space required by them is much less, and they are easy to keep without spoiling and easy to transport. Likewise, the containers for such foods are less costly than those required for canned foods and they are easily procured, since paper boxes or paper bags are satisfactory. In fact, the housewife, by taking care of the bags and boxes that come into the home, can easily provide all the containers she will possibly need at practically no cost.

109. The water in food that is to be dried may be evaporated by applying heat, by bringing the food in contact with moving air, or by subjecting it to a combination of both of these methods. The heat for drying may be obtained from the sun, as in the sun-drying method, or from the stove, as in the stove-drying method, while moving air for evaporating moisture may be obtained from an electric fan, as in the electric-fan drying method.

In the application of any of these drying methods, however, it is important to note that the more surface of food there is exposed, the more quickly will evaporation take place. Drying should therefore be done on devices constructed in such a way that air may pass up through food, as well as across its surface. In drying foods, the racks should be turned frequently, so that all parts will be exposed equally to the heat or the currents of air. Also, the food must be turned over often, in order that all parts will dry evenly.

110. Any fruit or vegetable may be dried if the method is properly applied, but there is usually more or less change in both the flavor and the color of the dried food. The more rapidly the drying can be done, the more natural will the color and flavor remain; whereas, the longer the process is continued, the greater will be this change.

Foods should be dried when they are in such quantity that they cannot be used to advantage in the raw state, when there is no market for them, when the owner cannot afford to give them away, and when home canning ceases to be practical and profitable. In other words, if it is not practical to save foods in another way, they should be dried.