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 Card with imprint:

Date of Issue: 05. 11. 2011
Face value: T2 50g 

Angličtina / English

Use translation by Google Translate (no guarantee).

Poštový lístok Historické poštové stanice - Stráže nad Zvolenom s prítlačou ku Dňu otvorených dverí rakúskych filatelistov 2011 vo Viedni (hosť: Slovensko).




Autor známky: Adrian Ferda
Autor prítlače: Adrian Ferd
Predajná cena: 0,50 €


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