I have a bunch of towels that have bleach spots or are just faded from so much use. Some are light blue and a couple are navy. I was thinking of buying some navy dye and dyeing them all the same color but was wondering if that would really work. Would it fully cover the bleach spots? And would the light and dark blue both turn out to be the same color or at least really close? I''ve never dyed anything before and need some advice! Thanks!