Casein: dog

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Casein: dog
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Casein identification guide: casein is a thermoset semi-synthetic polymer made from milk, hardened in formaldehyde.
1. Usually machined from sheet or rod stock, so they will have no mold marks.
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
    - 17-0 ANIMALS
      - 17-5 Mammals
        
        17-5.4 Dogs
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Button Specs