Collectors use a variety of other materials and accessories. Transparent glassine envelopes protect stamps from grease and air. A stamp catalog is a reference book with illustrations and stamp values. A magnifying glass is useful when examining stamps; tongs are used to pick up and move stamps. A perforation gauge measures perforations along the edges of stamps. Watermark fluid will enhance a watermark, a design or pattern that is pressed into some stamp paper during manufacturing.
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