At the occasion of the 50th anniversary of the establishment of diplomatic relations between the People’s Republic of China and the United States of Mexico, both countries have issued a set of two commemorative stamps on February 14, 2022. The first stamp represents the Star Observatory located in Gaocheng Town, Dengfeng City, Henan Province. It was founded in the early Yuan Dynasty by astronomer Guo Shoujing. It is the oldest existing and well-protected astronomical observatory in China. The second stamp represents the Kukulcan Pyramid located in the northern part of the Yucatan Peninsula in Mexico, the ancient city of Chichen Itza. Both sites were included in the UNESCO World Cultural Heritage. 

The stamps have a design showing the buildings in the dark and are quite difficult to represent on the screen. In fact, with the Chinese stamps, the design is improved by combining the pictures with light effects. The text of the stamp “Star Observatory” is made of extra-bright silver ink, the background halo and stars use colorless white fluorescence to highlight the night scene effect. In the “Chichen Itza temple” stamp, the text is made of extra-bright gold ink, and the background light is colorless orange fluorescence, which highlights the radiant effect of the sun. Additionally, both stamps are perforated on both sides with special star- or sun-shaped holes.