I have a black & white shirt, and when I washed it, the black bled into the white. So now instead of having a black & white shirt, I have a black and dingy white shirt. Is there anything I can do to return the white to its normal color without bleaching the black?
I have seen so many dark color/white stripe items that end up with this problem. Our Marketing folks like the “looks” of these for commercials and print ads, but there is such a range of quality in the dying that one really ends up rolling the dice when you buy one of these garments. When these dark colors are 100% cotton, they are notorious for bleeding for a few washes. When they are solid colors, they can always be washed/soaked with similar dark colors. Unfortunately, I probably don’t have much good news for you. Your only hope is to try to bleach the affected area, but I doubt the item can handle that without bleaching out the black color.
I would try the following:
First, we need to know if the black colored stripes can stand to be bleached. Just do the simple Bleachability Test on any colored portion in a hidden part of the shirt.
Also remember that washing in hotter water will SLOWLY remove additional dye over time. However, this will usually be barely perceptible wash-to-wash.