Casein identification guide: casein is a thermoset semi-synthetic polymer made from milk, hardened in formaldehyde
2. Easily hand-carved, used by skilled craftsmen and sculptors, mostly European, to create unique quality pieces.
source: Button Materials A-Z: Identification Guide
by Jocelyn Howells
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WRBA Button Album
Images of buttons are submitted by WRBA members. Categories are carefully assigned by designated editors. WRBA members are encouraged to send comments to the editors towards better description/categorization of buttons appearing in this album. WRBA Button Album is an ongoing educational project.
Complete Classification is available to the [members of the National Button Society].