Have no idea but your post reminded me of an incident when we lived in Bangkok. We had a maid who I have to say wasn't exactly the brightest kid on the block. She had a thing about using bleach and I was trying to wean her off it. Anyway - I had a new red and white striped t-shirt that she washed with something else red and the colour ran into the white stripes. So she tried to bleach the white stripes. Funnily enough it didn't work too well.
(She also cleaned our car with a brillo pad to make it shiny!)
I always think that. And wonder about whether to put similar things in the white or colored wash.
Actually ds had a top that was mainly red with a white bit at the top ( it looked like another top underneath but was attached iykwim) and that bit went pink.