Porous materials, such as mounting board andrag-stock paper, absorb moisture from the air. Thismoisture becomes trapped between the layers andcauses blisters and bubbles in the finished work For bestresults, you should predry the materials beforebeginning the dry-mounting process. This can be doneby heating the mounting board or paper in the mountingpress to remove the moisture.The time required to form a good bond varies whenyou are using a dry-mounting press. You should mountthe prints for a minimum amount of time-the timerequired to squeeze out air and moisture from thematerials and to activate the adhesive. Because differentmaterials have different thicknesses and heat-conducting characteristics, you must experiment todetermine what amount of time is required to form agood mount. Whenever possible, you should use scrapsof materials that are the same as your finished work todetermine the best time and temperature fordry-mounting prints.The final stage of finishing for some photographs isto frame them. There is an infinite number of colors andmaterials available for framing photographs. The sameprinciples apply for framing photographs that apply tomounting or matting prints. Keep it simple and choosea frame that compliments the photograph, rather thandistract from the picture.SLIDE MOUNTINGUnlike photographic prints, slides must be put intoslide mounts in order to be of any use. The process ofmounting slides ranges from a simple pair of scissors toslide-mounting machines, costing tens of thousands ofdollars.Whenever handling slides, you should wear cottongloves to avoid fingerprints on the image area. If finger-prints do get on the slides, a cotton ball moistened withfilm cleaner should be used to remove them.Slides can be mounted in either cardboard or plasticslide mounts. When using cardboard slide mounts, youmust heat them so the slide adheres to the mount. Navyimaging facilities use plastic slide mounts. The slidescan be placed in plastic slide mounts manually or bymachine.To mount slides manually, you must cut the roll intoindividual frames. Normally, this is done on a light tableso the edges of the frame can be seen clearly. To mounta slide, you simply slide the frame into an open slit onthe edge of the slide mount. On one side of the plasticslide mount is the lettering, “THIS SIDE TOWARDSSCREEN.” The lettering appears along the side of theopen slit. The slide is mounted properly when theemulsion side of the film faces the lettering, and the slideis straight. No light should pass between the edges of thefilm edges and the mount.When projected slides appear correctly on thescreen, they are placed in the projector (or slide tray)upside down and backwards, as viewed from theoperator’s position. An operator’s dot is often placed onthe slide mount to aid in organizing the slides in the tray.When the slide is viewed with the emulsion side towardsyou and the image is upside down, the operator's dot ismarked on the upper right-hand comer of the slidemount. The slides are placed into the slide tray correctlywhen the operator's dot can be seen facing the outsideof the tray.14-13
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