When blue is blue

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.

03. 05. 2025

Postage Stamp

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24. 11. 2017
Road Traffic Safety (BECEP)
Postage Stamp
Road Traffic Safety (BECEP)
16. 11. 2017
Christmas 2017: Vajnory folk painting
Postage Stamp
Christmas 2017: Vajnory folk painting
10. 11. 2017
Christmas Post 2017
Postage Stamp
Christmas Post 2017
08. 09. 2017
Radvan Market
Postage Stamp
Radvan Market
04. 09. 2017
Biennial of Illustrations Bratislava 2017
Postage Stamp
Biennial of Illustrations Bratislava 2017
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Philatelic partners

POFIS - Postal philatelic service
EXPONET - Virtual international philatelic exhibition
Slovak Society of Olympic and Sports Collectors
Filaso.cz ...or philatelists for themselves
OLYMPSPORT - Czech Association for Olympic and Sport Philately
ZSF - Union of Slovak Philatelists