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Chalky paper : ウィキペディア英語版 | Chalky paper
Chalky paper is a philatelic term for a type of paper coated with a chalky solution for security purposes.〔Scott Publishing Company, ''Classic Specialized Catalogue of Stamps & Covers'' (2007;) ISBN 0-89487-382-2〕 The postmark cannot be removed without damaging the surface of the stamp〔Bennett, Russell and Watson, James; ''Philatelic Terms Illustrated'', Stanley Gibbons Publications, London (1978).〕 thus discouraging erasure of cancellations and fraudulent reuse of stamps. The paper was first coated with a chalk-like powder, and the ink for the stamp was then impressed upon the paper. Collectors are cautioned not to attempt to remove a stamp printed on chalky paper from an envelope or paper backer by soaking it in fluid, as this may destroy the stamp's design. A simple test for chalky paper is to rub a silver coin over it, resulting in a "pencil" type mark.〔 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Chalky paper」の詳細全文を読む
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