Turkey blue

Etymology
From the manner of preparing indigo practiced in the Ottoman Empire ("Turkey"). .

Noun

 * 1)  A deep blue obtained by careful application of indigo dye to silk.
 * 2) * 1810, "Dyeing", Encyclopaedia Britannica, 4th ed., Vol. VII, §§300–302:
 * Silk is dyed blue with indigo alone, without any proportion of woad... with ſix pounds of bran, and about twelve ounces of madder... half a pound of madder for each pound of potaſh, renders the vat greener, and produces a more fixed colour in the ſilk... it is wrung out, and expoſed to the air, that the green colour may change to a blue... Some addition is required to be made to the indigo, to give ſilk a deep blue... For the Turkey blue, which is the deepeſt, a ſtrong bath of archil is firſt prepared. Conchineal is alſo ſometimes uſed, inftead of archil, for the ground, to render the colour more permanent.
 * 1)  An item dyed Turkey blue.
 * 1)  An item dyed Turkey blue.
 * 1)  An item dyed Turkey blue.

Adjective

 * 1)  Dyed Turkey blue.
 * 2)  Colored Turkey blue or  a similarly deep blue.