Casein identification guide: casein is a thermoset semi-synthetic polymer made from milk, hardened in formaldehyde.
Designed and painted by Edith and Alan J. Brooks
Trelandith Studio, 151 York Road, Haxby, York
source: Button Materials A-Z: Identification Guide
by Jocelyn Howells
The above is based on the National Button Society's Classification System.
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