Advertising in The Sun (Sydney) from the 1930s:
18th September 1932, in a full page advert for Grace Bros. Ltd:
20th February, 1934:
Erinoid was a trade name for casein plastic, so called because the milk came from Ireland (Erin). It was made at the Lightpill Mills in Stroud from 1914-1980s.
17th March, 1935.
29th March ,1936.
2nd June, 1936.
21st November, 1937.