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 Postage Stamp and Philatelie 2017

Day of Postage Stamp and Philatelie 2017
Day of use: 18. 12. 2017
 
Post office: BRATISLAVA 1
Colour: black

Angličtina / English

Use translation by Google Translate (no guarantee).

Commemorative postmark used in Bratislava on the occasion of the Day of Postage Stamp and Philatelie 2017 in Bratislava


Text motifs: DEŇ / POŠTOVEJ / ZNÁMKY A FILATELIE


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