With no aging, all tequilas come from the still as a clear blanco. However, as these agave distillates are barrel-matured to become reposados, añejos, or extra añejos, they take on ever-deepening hues that run the gamut from pale yellow to deep golden brown, depending upon the length of time they spend in oak and the types of barrels used. However, the just-released crystal-clear Herradura Ultra ($70) may give pause to those connoisseurs who claim they can tell whether a tequila is an añejo (which must be barr…