Borax in your laundry does produce small amounts hydrogen peroxide, so the possibility of fading of darks does exist. However I have used it for years and have never seen any fading.
Borax is a laundry whitener. It is one of the ingredients in homemade laundry detergent/soap, which I have used for years. None of my colored clothing have faded more than when I used store bought detergent.
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