the color blue (see Molina), turquoise blue
See an image that represents texotli in the Codex Mendoza, reproduced in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present). This color in glyphs can also be called xihuitl, and in glyphs, "xo."
texuctica tlacuiloli = painted blue
In the Digital Florentine Codex (Book 11, folio 219 recto, Anderson and Dibble translate texotli as "light blue" and "blue, very blue, green--a little brown, a little brown, thick," probably referring to the colors of the clay.
ce tzomitilmatli texotli = una manta de lana azul (Amecameca, 1625)