Azur is cast in graphite mold at Kosta Glassworks. The mold has an impression of one of Bertil Vallien's characteristic faces that has been blasted. The 2025 series is made in "Vallien blue" as the blue color has come to be known. "Blue is my favorite color, but it's not just a color, blue is a state of mind," as Bertil Vallien says.
