Casein: fish scale pearlized, double cut whistle

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

7. Many pearlized caseins, made by mixing fish scales into the plastic batch.

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
• Type:
  • 23-3 BACK TYPES
  • Whistle