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Blue rose
A blue rose is a flower of the genus ''Rosa'' (family Rosaceae) that presents blue-to-violet pigmentation instead of the more common red, white, or yellow. Blue roses are often portrayed in literature and art as a symbol of love and prosperity to those who seek it, but as a result of genetic limitations do not exist in nature. White roses have been dyed blue. In 2004, researchers used genetic modification to create roses that contain the blue pigment delphinidin.
So-called "blue roses" have been bred by conventional hybridization methods, but the results, such as "Blue Moon", are more accurately described as being lilac in color.
==Dyed roses==
Since blue roses do not exist in nature, as roses lack the specific gene that has the ability to produce a "true blue" color, blue roses are traditionally created by dyeing white roses. In a book entitled ''Kitab al-felahah''〔(WorldCat ref for Kitab al-felahah )〕 written by Ibn al-‘Awwām al-Ishbīlī〔http://www.filaha.org/author_ibn_al_awwam.html〕 in Arabic in the 12th century, and translated into French by J. J. Clement as ''Le livre de l'agriculture,''〔(Rosegathering: symbolic meaning of color in roses )〕 there are references to azure blue roses that were known to the orient. These blue roses were made by placing a blue dye into the bark of the roots.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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