^The color displayed in the color box above matches the color called periwinkle in the 1930 book by Maerz and Paul A Dictionary of Color New York: 1930 McGraw-Hill; the color periwinkle is displayed on page 109, Plate 43, Color Sample B8.
^Maerz and Paul (1930). A Dictionary of Color. New York: McGraw-Hill. Page 196: Lavender blue shown as one of the three major variations of lavender under heading lavender; page 190: lavender blue is listed as blue-lavender, first use of the color term is identified as 1926, and the color is identified with periwinkle.