Answer: glassine

AnswerCrossword Clue
GLASSINEClear envelope material
GLASSINEClear, like an envelope
GLASSINEStamp collector's envelope
GLASSINEWater-resistant paper
GLASSINEKind of paper.
GLASSINENearly transparent paper
GLASSINEWindow envelope material
GLASSINEEnvelope material
GLASSINETranslucent envelope material
glassinea type of paper
glassinea thin dense transparent or semitransparent paper highly resistant to the passage of air and grease