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:
Youth Philatelic Exhibition JUNIORFILA 2015

Youth Philatelic Exhibition JUNIORFILA 2015
Day of use: 13. 06. 2015
 

Angličtina / English

Use translation by Google Translate (no guarantee).

Commemorative postmark on the occassion of the Youth Philatelic Exhibition JUNIORFILA 2015 in Nitra.


Text motifs: Juniorfila / 2015

Pictorial motifs: Robot drží zúbkovanú známku s rokom 2015.

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