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:
Day of Slovak postage stamp and philatelie 2012

Day of Slovak postage stamp and philatelie 2012
Day of use: 18. 12. 2012
 

Angličtina / English

Use translation by Google Translate (no guarantee).

Príležitostná poštová pečiatka používaná pri príležitosti Dňa slovenskej poštovej známky a filatelie v Bratislave.




Deň používania: 18. 12. 2012
Pošta: BRATISLAVA 1
Farba: čierna
Autor: Adrian Ferda
Textový motív: DEŇ SLOVENSKEJ POŠTOVEJ ZNÁMKY A FILATELIE
Obrazový motív: Krúžkový kalendár s dátumom 18. 12. 2012.


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