En plein air: how a tube revolutionised painting

En Plein Air - Modern Art Terms and Concepts

Painting En Plein Air With Oils

En Plein Air - Modern Art Terms and Concepts

National Gallery - The invention of the paint tube in 1841

Macchiaioli vs. Impressionists: Why did one 19th Century art

Industrial Revolution — Timeline of Art

A Breath of Fresh Air: The Rich and Rebellious History of En Plein

En Plein Air - Modern Art Terms and Concepts

Is Watercolour Better in Pans or Tubes? - Jackson's Art Blog

Fox Chase: Painting Tools - Florence Griswold Museum

The Real Story and Facts Behind Claude Monet's Water Lilies

What Is Plein Air Painting?. So that I (and you) can use the term

Lesley Powell: From my Easel: Revolution in a Tube