Meeting of collectors of postcards and paper objects KSK in Prague (Czech Republic)

Invitation to a meeting of postcard and paper object collectors of the Curio Collectors' Club (KSK) in Prague (Czech Republic).

11. 04. 2026
Complete description

When blue is blue

When blue is blue
Author: Vladimír Kuchtanin
Source: www.postoveznamky.sk
Published: 03. 05. 2025 23:47

Scientific treatise and study on the composition of the paint on the Protectorate 5h blue linden leaf stamp. Study of the dependence of the amount of paint on the color shade of postage stamps.




Author: Vladimír Kuchtanin

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