1950s
Source: 'Questions to Students', one from a long list of questions, in an undated typescript among the David Smith Papers; probably written c. 1953-54; as quoted at website David Smith State http://www.davidsmithestate.org/statements.html
Quotes about patina
A collection of quotes on the topic of patina, news, life, likeness.
Quotes about patina

Microcosmos: Four Billion Years of Evolution from Our Microbial Ancestors (1986)

Oingo Boingo The History Of Rock Music http://www.scaruffi.com/vol4/oingo.html

Quote, 1920's; MPC p. 13; as quoted in Dali and Me, Catherine Millet, - translation Trista Selous -, Scheidegger & Spiess AG, 8001 Zurich Switzerland, p. 28
Quotes of Salvador Dali, 1920 - 1930

Source: No More Bull! (2005), Ch. 4: Alzheifer's Disease?, p. 56