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:
Bratislava Collectors Days 2015 (Grassalkovich Palace)

Bratislava Collectors Days 2015 (Grassalkovich Palace)
Day of use: 05. 06. 2015
 
Post office: BRATISLAVA 5
Colour: black

Angličtina / English

Use translation by Google Translate (no guarantee).

Commemorative postmark on the occassion of the Bratislava Collectors Days 2015.




Príležitostná pečiatka sa v deň používania používa na výstavisku Incheba v Bratislave a nasledujúcich sedem dní na pošte Bratislava 5.


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