Casein: imitation tortoise shell

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This button has a pearl inlay.

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

5. Most often opaque, although there are some translucent and transparent buttons.

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
    • 12-9 Other material embellishment
  • 12-8.5 Imitation tortoise shell horn