Casein: bird, fabric OME

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Without the photo of the back of this button, we cannot classify it.

Casein identification guide: casein is a thermoset semi-synthetic polymer made from milk, hardened in formaldehyde

2. Easily hand-carved, used by skilled craftsmen and sculptors, mostly European, to create unique quality pieces.

source: Button Materials A-Z: Identification Guide
by Jocelyn Howells

Button Specs

• Material:
  • 12-0 Synthetic Polymer
    • 12-1 Thermoset types
      • 12-1.2 Casein
• Design:
  • PICTORIALS (17-21)
  • 17-0 ANIMALS
    • 17-2 Birds