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What makes the darkest version any more of a "true black" than the lightest version? Their all the same hue, that ones just the "brown" version of a normal horse, so how can it be "true"?
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It's just a naming convention that has gained popular acceptance. Don't get your knickers in a knot.
It probably started with the first black dye tubs way back in the early days of UO, although who knows, they might have been calling the darkest black mares "true black" even before the dye tubs came along, or the purest white wyrms, "true white" (notice that "true black" is shorter and easier to type than "darkest black"
), although something tells me that the first time I heard the phrase "true black" it was either referring to those black dye tubs, or cloth or clothing dyed with them.