Colored Undergarments

Question

Dear Rav: In an earlier message, a questioner had asked "if a woman did not wear white underwear during part of these seven days and her bed sheets as well were not solid white does that nullify any of the "clean days"?" And your reply was "no". My question is what if a woman wore red or black underwear during any of the seven clean days, would that nullify any of the clean days? Thanks