Postage stamp
device · 1840 · Industrial Revolution
The Penny Black (Hill).
What it is made of
- Postage stamp paper — has part. Watermarked paper.
- Perforated tear line — has part. Teeth for tearing off.
- Gummed adhesive back — has part. Gum on the back.
Principles and materials it uses
- Postal service — uses. Paying for delivery.
- Offset printing — uses. Printing.
- Paper — is made of. Paper.