If the quilt is big enough as is, I wouldn't add another border. You just have the one & it's so beautiful with all its detail, a solid (mottled) border will end up detracting from all the lovely piecing/applique work you've done. Also, I know it can be challenging, but what about a double-sided binding -- red on the back & black on the front. I really think the black binding on the front ties everything together better; the red stands out a bit too much & draws all the focus to the red border & the red binding.
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