Glassine

Glassine is a smooth and glossy paper that is air, water, and grease resistant. It is translucent unless dyes are added to color it or make it opaque. It is manufactured by supercalendering: after pressing and drying, the paper web is passed through a stack of alternating steel- and fiber-covered rolls called a supercalender at the end of the paper machine so that the paper fibers flatten facing in the same direction.