The white of the roof is just a cosmetic thing and it's only real purpose is appearance and also reflects the suns heat. ALL rubber is black and our roofs are no different. If you could look under the white you will find the black membrane. In short, If you don't see BLACK than I would not be at all concerned and would leave well enough alone. Remember anything you do to your rubber roof could adversely effect your 10 year roof warranty.
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