Eschel blue

English Noun Eschel blue ! A specific shade of blue, a trademarked color name. en 1874 A Practical Treatise on the Manufacture of Colors for Painting, Comprising the Origin, Definition, and Classification of Colors; the Treatment of the Raw Materials Etc Jean René Denis Riffault des Hêtres, Armand Denis Vergnaud, G. Alvar Toussaint 352 Independently of the ordinary smalt, there is another darker blue, with a very fine grain, and which is generally called Eschel blue or Laundry blue.