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I suppose some cowhides might look reddish-brown but presumebly youre refferring to red dyed animal hides (not likely on a Manchu )
I was referring to cowhides, which can look
very red.
I wasn't referring to dyes, which they had, but I do not think they used them for shoes.
I know wood workings would be dyed and/or painted,
but the only color I know
for sure that was a period dye would be blue.