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Robin egg blue, also called eggshell blue or robin's-egg blue, is a shade of teal (a blue-green color), approximating the shade of the eggs laid by the American robin, an abundant songbird of North America. The egg pigment is biliverdin, a product of the breakdown of heme.
The first recorded use of robin egg blue as a color name in English was in 1873, though earlier references in English to colors similar to that of robin's eggs were made as early as 1844. The "robin's egg" glaze appeared during the Yongzheng Emperor’s reign (1722-35) in China, and Yixing potter Hua Fengxiang made works with "robin's egg" glaze.
Halepas, Steven; Hamchand, Randy; Lindeyer, Samuel E. D.; Brückner, Christian (2017). "Isolation of Biliverdin IXα, as its Dimethyl Ester, from Emu Eggshells". Journal of Chemical Education. 94 (10): 1533–1537. Bibcode:2017JChEd..94.1533H. doi:10.1021/acs.jchemed.7b00449.
Maerz and Paul (1930). "Color Sample of Robin Egg Blue Page 77 Plate 27 Color Sample H3". A Dictionary of Color. New York: McGraw-Hill. p. 203.
Jackson, C. T. (1844). Final Rep. Geol. & Minerol. New Hampshire.
American robin eggs
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