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Arthur Guptill said, "A rich effect can be obtained with only a limited palette. A warm and cool combination affords the student the best approach to his color problems, especially as they relate to outdoor sketching."

Greta Bridge by John Sell Cotman

In his book on the history of watercolor painting, E. Barnard Lintott said, "For a young student there cannot be a better way of entering upon the study of water colour than by rigorously banishing all but two colours from his palette. It is the best and surest way to the study of full colour. The colours should be a cold and warm one; cobalt blue and warm sienna—or Prussian blue and burnt sienna—are two combinations which lend themselves to a great variety of treatment."

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More about painting in complementary colors on m Gumroad tutorial "Color in Practice: Black, White, and Complements."

Quotes comes from Color in Sketching and Rendering, p. 71.