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

Postage Stamp

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04. 05. 2018
EUROPA 2018: Bridges - The SNP Bridge in Bratislava
Postage Stamp
EUROPA 2018: Bridges - The SNP Bridge in Bratislava
03. 05. 2018
1150th anniversary of the recognition of the Slavonic liturgical language (Joint issue with Vatican City State)
Postage Stamp
1150th anniversary of the recognition of the Slavonic liturgical language (Joint issue with Vatican City State)
27. 04. 2018
Beauties of our Homeland: Archeological site Poprad-Matejovce
Postage Stamp
Beauties of our Homeland: Archeological site Poprad-Matejovce
14. 03. 2018
Personalities: Karol L. Zachar (1918 – 2003) - 100th birth anniversary
Postage Stamp
Personalities: Karol L. Zachar (1918 – 2003) - 100th birth anniversary
01. 03. 2018
Personalities: Adam František Kollár (1718 – 1783) - 300th birth anniversary
Postage Stamp
Personalities: Adam František Kollár (1718 – 1783) - 300th birth anniversary
27. 02. 2018
Easter 2018: Paramentos - liturgical textiles
Postage Stamp
Easter 2018: Paramentos - liturgical textiles
23. 02. 2018
XII. Winter Paralympic Games PyeongChang 2018 - Downhill skiing
Postage Stamp
XII. Winter Paralympic Games PyeongChang 2018 - Downhill skiing
16. 02. 2018
Cultural heritage of Slovakia: VÚB Mlynské Nivy in Bratislava
Postage Stamp
Cultural heritage of Slovakia: VÚB Mlynské Nivy in Bratislava
19. 01. 2018
XXIII Winter Olympic Games PyeongChang 2018 - Alpine skiing
Postage Stamp
XXIII Winter Olympic Games PyeongChang 2018 - Alpine skiing
05. 01. 2018
Monument of the Romanian Royal Army in Zvolen (Joint issue with Romania)
Postage Stamp
Monument of the Romanian Royal Army in Zvolen (Joint issue with Romania)
02. 01. 2018
25th anniversary of the founding of the Slovak Republic
Postage Stamp
25th anniversary of the founding of the Slovak Republic
04. 12. 2017
Day of postage stamp: Jozef Vlček (1902 – 1971)
Postage Stamp
Day of postage stamp: Jozef Vlček (1902 – 1971)
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
31. 10. 2017
Historical Anniversaries: 500th anniversary of the Reformation (1517)
Postage Stamp
Historical Anniversaries: 500th anniversary of the Reformation (1517)
23. 10. 2017
Art: Altar of St. Jakob in the Church of St. Jakob in Levoca
Postage Stamp
Art: Altar of St. Jakob in the Church of St. Jakob in Levoca
23. 10. 2017
Art: Jozef Božetech Klemens - Portrait of Mrs Juppová
Postage Stamp
Art: Jozef Božetech Klemens - Portrait of Mrs Juppová
12. 10. 2017
Nature protection: Rare fungi - Violet Coral (Clavaria zollingeri)
Postage Stamp
Nature protection: Rare fungi - Violet Coral (Clavaria zollingeri)
12. 10. 2017
Nature protection: Rare fungi - Caloscypha (Caloscypha fulgens)
Postage Stamp
Nature protection: Rare fungi - Caloscypha (Caloscypha fulgens)
02. 10. 2017
Personalities: Božena Slančíková-Timrava (1867 – 1951) - 150th birth anniversary
Postage Stamp
Personalities: Božena Slančíková-Timrava (1867 – 1951) - 150th birth anniversary
08. 09. 2017
Radvan Market
Postage Stamp
Radvan Market
07. 09. 2017
Sport: A. Kvašňák, V. Nedomanský, J. Torma
Postage Stamp
Sport: A. Kvašňák, V. Nedomanský, J. Torma
04. 09. 2017
Biennial of Illustrations Bratislava 2017
Postage Stamp
Biennial of Illustrations Bratislava 2017
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