The first recorded use of robin egg blue as a color name in English was in 1873,[3] though earlier references in English to colors similar to that of robin's eggs were made as early as 1844.[4] 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.[5]
↑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.