If it is so faint you don't think someone else would notice why would you point it out, try to make them see it? That doesn't make sense to me. It could just be you are seeing faint pink reflecting from the pinks. I would set it aside for a couple days and then look at it again, outside if possible ( sometimes our indoor lighting can cause a color cast that really isn't there. If it is still there and apparent the synthropol wash should take care of it. If you really don't want to wash it in hot water ( which is required for synthropol) then try doing it again with more color catchers