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
Complete description

Postal Card with imprint

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07. 07. 2023
Public poll for the most Beautiful Slovak Stamp of 2022 (Postal History)
Postal Card with imprint
Public poll for the most Beautiful Slovak Stamp of 2022 (Postal History)
13. 10. 2022
Public poll for the most Beautiful Slovak Stamp of 2021
Postal Card with imprint
Public poll for the most Beautiful Slovak Stamp of 2021
17. 12. 2021
Day of postage stamp and philately 2021
Postal Card with imprint
Day of postage stamp and philately 2021
16. 09. 2021
National Philatelic Exhibition of One-Frame Exhibits NITRA 2021
Postal Card with imprint
National Philatelic Exhibition of One-Frame Exhibits NITRA 2021
01. 03. 2021
100 years of Krásy Slovenska (Beauties of Slovakia) magazine
Postal Card with imprint
100 years of Krásy Slovenska (Beauties of Slovakia) magazine
18. 12. 2020
Day of postage stamp and philately 2020
Postal Card with imprint
Day of postage stamp and philately 2020
01. 06. 2020
Public poll for the most Beautiful Slovak Stamp of 2019 (Good Idea Slovakia)
Postal Card with imprint
Public poll for the most Beautiful Slovak Stamp of 2019 (Good Idea Slovakia)
31. 10. 2019
90 years of Holuby`s cottage
Postal Card with imprint
90 years of Holuby`s cottage
15. 10. 2019
100 years since the declaration of the Zemplin County
Postal Card with imprint
100 years since the declaration of the Zemplin County
05. 10. 2019
100th Anniversary of the birth of Vojtech Zamarovsky
Postal Card with imprint
100th Anniversary of the birth of Vojtech Zamarovsky
27. 09. 2019
2nd Assembly of the Union of Slovak Philatelists (ZSF)
Postal Card with imprint
2nd Assembly of the Union of Slovak Philatelists (ZSF)
10. 09. 2019
Public poll for the most Beautiful Slovak Stamp of 2020
Postal Card with imprint
Public poll for the most Beautiful Slovak Stamp of 2020
06. 09. 2019
International collectors fair SBĚRATEL (COLLECTOR) 2019
Postal Card with imprint
International collectors fair SBĚRATEL (COLLECTOR) 2019
07. 06. 2019
National Youth Philatelic Exhibition JUNIORFILA 2019
Postal Card with imprint
National Youth Philatelic Exhibition JUNIORFILA 2019
07. 06. 2019
Bratislava Collectors Days 2019
Postal Card with imprint
Bratislava Collectors Days 2019
17. 05. 2019
Public poll for the most Beautiful Slovak Stamp of 2018
Postal Card with imprint
Public poll for the most Beautiful Slovak Stamp of 2018
17. 04. 2019
250th anniversary of the establishment of a permanent post office in Banská Bystrica (Post Horn)
Postal Card with imprint
250th anniversary of the establishment of a permanent post office in Banská Bystrica (Post Horn)
22. 02. 2019
Petra Vlhová - world champion in giant slalom (Good Idea Slovakia)
Postal Card with imprint
Petra Vlhová - world champion in giant slalom (Good Idea Slovakia)
08. 01. 2019
Blessed Titus Zeman
Postal Card with imprint
Blessed Titus Zeman
18. 12. 2018
Day of postage stamp and philately 2018
Postal Card with imprint
Day of postage stamp and philately 2018
20. 10. 2018
Czechoslovak National Council 1916 - 1918
Postal Card with imprint
Czechoslovak National Council 1916 - 1918
20. 10. 2018
Czechoslovak Provisional Government in Slovakia
Postal Card with imprint
Czechoslovak Provisional Government in Slovakia
20. 10. 2018
Jubilee Philatelic Exhibition C-S SALON 2018
Postal Card with imprint
Jubilee Philatelic Exhibition C-S SALON 2018
22. 09. 2018
25th anniversary of the Slovak Olympic Committee
Postal Card with imprint
25th anniversary of the Slovak Olympic Committee
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