Casein: fish scale pearlized, England, sew-through

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This button is a press-molded wafer. Back marks are uncommon in casein buttons.

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
    • 12-3 Back marks
    • 12-10 Techniques assorted
      • 12-10.14 Molded
• Type:
  • 23-2.1 British
  • 23-2 Back Marks