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 Materials

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13. 11. 2019
30th Anniversary of the Velvet Revolution (joint issue with the Czech Republic)
Postage Stamp
30th Anniversary of the Velvet Revolution (joint issue with the Czech Republic)
08. 11. 2019
Christmas 2019: Traditional Slovak Tinkering
Postage Stamp
Christmas 2019: Traditional Slovak Tinkering
08. 11. 2019
Christmas Post 2019 (with a personalized coupon)
Postage Stamp
Christmas Post 2019 (with a personalized coupon)
08. 11. 2019
110th Anniversary of the founding of Slovensky Orol (Slovak Eagle)
Commemorative Postmark
110th Anniversary of the founding of Slovensky Orol (Slovak Eagle)
08. 11. 2019
Inter Bratislava - 40th anniversary of the 1st title of Czechoslovak champion in basketball in 1979 (postage stamp State motif)
Personalised adjusted printing sheet (PersUTL)
Inter Bratislava - 40th anniversary of the 1st title of Czechoslovak champion in basketball in 1979 (postage stamp State motif)
08. 11. 2019
Christmas 2019: Traditional Slovak Tinkering (comet and angel)
Pictorial Postal Card
Christmas 2019: Traditional Slovak Tinkering (comet and angel)
08. 11. 2019
Good news (Christmas Post 2019)
Personalised adjusted printing sheet (PersUTL)
Good news (Christmas Post 2019)
31. 10. 2019
90 years of Holuby`s cottage
Postal Card with imprint
90 years of Holuby`s cottage
24. 10. 2019
Exhibition TRI PODOBY M. R. STEFANIKA (= THREE FACES OF M. R. STEFANIK)
Commemorative Postmark
Exhibition TRI PODOBY M. R. STEFANIKA (= THREE FACES OF M. R. STEFANIK)
18. 10. 2019
Art: Ernest Zmeták (1919 – 2004) - Self portrait with paper cap
Postage Stamp
Art: Ernest Zmeták (1919 – 2004) - Self portrait with paper cap
18. 10. 2019
Art: Ladislav Hudec (1893 – 1958) - Villa Dr. Woo
Postage Stamp
Art: Ladislav Hudec (1893 – 1958) - Villa Dr. Woo
18. 10. 2019
Inauguration of the postage stamp Art: Ernest Zmeták (1919 – 2004)
Commemorative Postmark
Inauguration of the postage stamp Art: Ernest Zmeták (1919 – 2004)
18. 10. 2019
Inauguration of the postage stamp Art: Ladislav Hudec (1893 – 1958)
Commemorative Postmark
Inauguration of the postage stamp Art: Ladislav Hudec (1893 – 1958)
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
11. 10. 2019
Nature protection: Fruit trees - pear
Postage Stamp
Nature protection: Fruit trees - pear
10. 10. 2019
Inauguration of the postage stamp Nature protection: Fruit Trees - Pear
Commemorative Postmark
Inauguration of the postage stamp Nature protection: Fruit Trees - Pear
07. 10. 2019
Silver Incense Burner from the Famen Temple (Joint Issue with the People’s Republic of China)
Postage Stamp
Silver Incense Burner from the Famen Temple (Joint Issue with the People’s Republic of China)
07. 10. 2019
Bronze Phalera from Podunajské Biskupice (Joint Issue with the People’s Republic of China)
Postage Stamp
Bronze Phalera from Podunajské Biskupice (Joint Issue with the People’s Republic of China)
07. 10. 2019
Inauguration of the postage stamps Joint Issue with the People’s Republic of China
Commemorative Postmark
Inauguration of the postage stamps Joint Issue with the People’s Republic of China
06. 10. 2019
International Peace Marathon 2019
Commemorative Postmark
International Peace Marathon 2019
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
100th Anniversary of the Paris Peace Conference
Postage Stamp
100th Anniversary of the Paris Peace Conference
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
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