There, in pixel-perfect detail, was the anomaly he held in his tweezers. The "Bleu Lumineux"—a rare shade caused by a chemical reaction in the ink batch of October 1849.
Founded in 1896 in Amiens, France, Yvert et Tellier began as a family printing business. It quickly transformed into one of the world's most respected philatelic publishers. While their traditional multi-volume paper catalogues remain a staple on bookshelves, the shift toward a digital platform has revolutionized how collectors interact with their hobby. yvert et tellier catalogue online