<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">casein plastic</topic></authority><related type="broader"><topic>thermoset</topic></related><variant type="other"><topic>Karolith</topic></variant><variant type="other"><topic>milkstone</topic></variant><variant type="other"><topic>plastics, casein</topic></variant><variant type="other"><topic>Lactoid</topic></variant><variant type="other"><topic>Aladdinite</topic></variant><variant type="other"><topic>casein plastics</topic></variant><variant type="other"><topic>plastic, casein</topic></variant> <note xml:lang="en"><![CDATA[ Thermoplastic molding materials prepared from casein, a natural phosphorous-containing protein found in milk. While trying to make a waterproof coating in 1897, Adolph Spitteler and associate W. Krische of Germany discovered that casein becomes hard and insoluble when treated with formaldehyde. Casein plastics were used for small items such as buttons, beads, buckles, combs, fountain pens, umbrella handles, cutlery handles, and knitting needles; they are often pigmented to simulate ivory, horn, or tortoise shell. ]]></note></mads>