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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
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Material
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Types
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