What would I say is “the” color of the cloth in my image? Even more than with other colors, how it looks depends on lighting and surroundings. This pretty color is a visual metaphor: relationships mean more than intrinsic properties.
Colorful Plain English
Inkjets squirt cyan;
some poets sing of turquoise.
I just see blue-green.
For most purposes, I prefer blue-green (and 2 variations on it) over the other names. Anybody who knows what blue and green mean can guess what blue-green means. Those who need more choices for naming colors like this can put blue-green between bluish green (AKA aqua) and greenish blue (AKA turquoise). The 3 names I prefer are all clearer than names like aqua about where they lie on the range from just plain blue to just plain green.
Nerdy 😉 Note
Need still more choices? Use Red|Green|Blue coordinates. The 256x256x256 possible values for the RGB coordinates of a color can make more distinctions than U will ever need.
For example, the image below is a detail from the image above, with little yellow circles around 2 spots on the cloth, one relatively bright and another relatively dark. Most spots on the cloth have [R|G|B] between the bright spot’s [45|223|226] and the dark spot’s [0|48|86].
If U like one of those colors enough to want it as a text or background color, U can use the corresponding hexadecimal code (#2DDFE2 or #003056) in an HTML style sheet. Explicit hex codes avoid the bother of remembering the sometimes flaky conventional names for web colors.
Hex codes also provide flexibility. Colors rarely look the way one expects when picking a color by pointing to it in another context, as I noticed when I used colors from an image to add a haiku to the image and then to write text referring to parts of the haiku. Bumping coordinates up or down can adjust colors to look good in actual use.