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I agree.Dyeing stripes won't really work; the surface of the blanket is too fibrous to be able to do it neatly.
I believe that the indigo blue stripes tended to be on blankets from the AWI, while those from 1812 (at least those from the HMS Boxer) had brown stripes. In his study Stone thought it likely the stripes were originally black. I know that period textile dyes in the black/grey range would change colour to green or brown, depending on the coloring agent; I suspect this happened to the blanket stripes in question. Same thing with period ink--black when originally written, but now appears brown.As to the colour, I have seen Blue ones and Brown, never black.