Chalky paper
{{Short description|Type of paper for stamps}}
In philately, chalky paper is 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 stampBennett, 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.