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<br />evaporation of water in the microwave can cause vapor explosions in the covers and <br />inside pages of coated stock. <br /> <br />If frozen materials are vacuum dried, most of the water will pass through the liquid state <br />before vaporizing. As a result, water-soluble inks and dyes may bleed. <br /> <br />FREEZING <br /> <br />Freezing wet materials will stabilize them and provide you with time to determine your <br />course of action. Mold will not grow and further deterioration from water will not occur <br />when materials are in a frozen state. Books have been left in a freezer for ten years and <br />successfully thawed and air-dried with no resultant damage. Freezing will also help to <br />eliminate smoke odor from materials. <br /> <br />Rapid freezing is recommended to minimize damage from ice crystals (the faster the <br />materials are frozen, the smaller the ice crystals will be). Blast freezing services can be <br />performed on site. <br /> <br />Freezing is an intermediate stage. After materials have been removed from the freezer, <br />they must be placed in a vacuum freeze dryer or air-dried. <br /> <br />AIR-DRYING <br /> <br />Air-drying is labor intensive and requires a great deal of space, but it is tried, true and <br />cheap. It also offers security, as it can be done in-house and materials can be watched. <br /> <br />Air-drying should be performed only in a stable environment to inhibit the growth of mold. <br />The ideal environment for air-drying is 500-600F and 25-35% RH. This process is NOT <br />recommended for coated stock materials. <br /> <br />PHOTOGRAPHIC MATERIAL <br /> <br />a) Color film and photographs: <br /> <br />1 ) Obtain professional assistance with restoration. <br /> <br />2) Silver or emulsion film and photographs: <br /> <br />3) Air dry (if not too many and if time permits) either flat or on lines. <br /> <br />4) If too many to air-dry, store in cold water (640F or below) for up to three (3) <br />days. Formaldehyde may be added to water at a ration of 15 ml. to 1 liter. <br /> <br />5) Transport to or have picked up by a professional photography laboratory <br />within twenty-four (24) hours. <br /> <br />6) If time does permit air-drying or transporting to a professional laboratory, <br />freeze quickly. (Less damage is caused by freezing than by delaying <br />treatment) . <br /> <br />Page 31 <br />