Glassine Envelopes for Butterflies Size #4
(4 7/8" x 3 1/4")
Glassine envelopes made from transparent virgin 30# glassine, side seams with ungummed top flap
The #4 glassine envelopes are ideal for collecting, storing, and shipping large-sized butterflies like Monarchs and Swallowtails. Butterflies should be placed in the envelopes with their wings folded closed in resting position.
Why glassine? glassine is a smooth, translucent paper made from a manufacturing process called supercalendering. The paper pulp is beaten to break down the fibers. After pressing and drying, the paper web is passed through a stack of hard pressure rollers. This pressing of the paper fibers in the machine direction buffs the paper, producing a very smooth, enamel-like and acid-free surface. And the clarity of the glassine allow good visibility of the contents.