Hi Marcus,
If you can get a small sample of the original unfaded, you can get a white carpet and get it dyed, even if has some black, or dark blue fibers in it. After 4 years of searching for turquoise, getting a custom dye formulated, and white German Square Weave carpet and dying was the only way I could get an exact match. Not cheap, and does take some time, but it can be done, all you need is a sample of unfaded original carpet.