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

Commemorative Postmark

Beginning   <<   1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   >>   End
13. 03. 2025
100th anniversary of the birth of Zuzana Chalupová (1925 - 2001)
Commemorative Postmark
100th anniversary of the birth of Zuzana Chalupová (1925 - 2001)
21. 02. 2025
Inauguration of the postage stamp Easter 2025: Sacred motifs of historical manuscripts of the Ján Bocatí Public Library in Košice
Commemorative Postmark
Inauguration of the postage stamp Easter 2025: Sacred motifs of historical manuscripts of the Ján Bocatí Public Library in Košice
20. 01. 2025
Inauguration of the postage stamp 100th anniversary of the Ice Hockey European Championship in the High Tatras
Commemorative Postmark
Inauguration of the postage stamp 100th anniversary of the Ice Hockey European Championship in the High Tatras
04. 12. 2024
Introduction of the postage stamp Personalities: Janko Jesenský (1874 – 1945)
Commemorative Postmark
Introduction of the postage stamp Personalities: Janko Jesenský (1874 – 1945)
03. 12. 2024
100 years of the Handlová Chess Club
Commemorative Postmark
100 years of the Handlová Chess Club
27. 11. 2024
Janko Jesenský - Nitra County Governor
Commemorative Postmark
Janko Jesenský - Nitra County Governor
19. 10. 2024
95th anniversary of Philatelist Club 52-32 Malacky
Commemorative Postmark
95th anniversary of Philatelist Club 52-32 Malacky
06. 10. 2024
Medzinárodný maratón mieru 2024
Commemorative Postmark
Medzinárodný maratón mieru 2024
04. 10. 2024
Inauguration of the postage stamp 100th anniversary of the International Peace Marathon in Kosice
Commemorative Postmark
Inauguration of the postage stamp 100th anniversary of the International Peace Marathon in Kosice
06. 09. 2024
Inauguration of the postage stamp Beauties of our Homeland: Hricov Castle
Commemorative Postmark
Inauguration of the postage stamp Beauties of our Homeland: Hricov Castle
26. 07. 2024
Introduction of the postage stamp Personalities: Monk Cyprian (1724 - 1775
Commemorative Postmark
Introduction of the postage stamp Personalities: Monk Cyprian (1724 - 1775
26. 07. 2024
Inauguration of the postage stamp Personalities: Monk Cyprian (1724 - 1775)
Commemorative Postmark
Inauguration of the postage stamp Personalities: Monk Cyprian (1724 - 1775)
12. 07. 2024
European folk craft festival 2024
Commemorative Postmark
European folk craft festival 2024
30. 05. 2024
World carnivals through the lens of Michal Hertlík
Commemorative Postmark
World carnivals through the lens of Michal Hertlík
21. 03. 2024
800th anniversary of the foundation of the Benedictine abbey in Skalka near Trencin (stamp issue)
Commemorative Postmark
800th anniversary of the foundation of the Benedictine abbey in Skalka near Trencin (stamp issue)
26. 01. 2024
200th anniversary of the poetic composition Slávy dcéra (Glory Daughter)
Commemorative Postmark
200th anniversary of the poetic composition Slávy dcéra (Glory Daughter)
12. 01. 2024
Jozef Kardinál Tomko (1924 – 2022) - 100th birth anniversary
Commemorative Postmark
Jozef Kardinál Tomko (1924 – 2022) - 100th birth anniversary
12. 01. 2024
Inauguration of the postage stamp Personalities: Ján Chryzostom Korec and Jozef Tomko
Commemorative Postmark
Inauguration of the postage stamp Personalities: Ján Chryzostom Korec and Jozef Tomko
13. 11. 2023
200th anniversary of the stagecoach post Bratislava - Vienna
Commemorative Postmark
200th anniversary of the stagecoach post Bratislava - Vienna
10. 11. 2023
Introduction of the postage stamps Art: The Gothic Way
Commemorative Postmark
Introduction of the postage stamps Art: The Gothic Way
09. 11. 2023
Opening of the exhibition 160TH ANNIVERSARY OF THE OPENING OF THE MILITARY SPA INSTITUTE in Piešťany (Slovakia)
Commemorative Postmark
Opening of the exhibition 160TH ANNIVERSARY OF THE OPENING OF THE MILITARY SPA INSTITUTE in Piešťany (Slovakia)
09. 11. 2023
Opening of the exhibition THE BEST OF FRANTIŠEK HORNIAK`S WORKS (Rišňovce)
Commemorative Postmark
Opening of the exhibition THE BEST OF FRANTIŠEK HORNIAK`S WORKS (Rišňovce)
30. 10. 2023
100 years of the first civil flight Vajnory - Praha
Commemorative Postmark
100 years of the first civil flight Vajnory - Praha
27. 10. 2023
Samuel Timon - Founder of critical historiography
Commemorative Postmark
Samuel Timon - Founder of critical historiography
Beginning   <<   1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   >>   End

TOP Philatelic Events

Materials by category

Latest materials

... all materials

Newsletter

Monthly we send to your email info about events, new articles, materials and other interesting news.

Current news on the philately and stamp collecting

... all messages

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