Dye to cover up detergent "burns"
I have a handful of cotton or cotton/poly t-shirts that have discolored spots that I guess are from the detergent sitting in that spot too long.
I would like to dye them a solid color (most likely black), but the last time I had anything to do with fabric dye was maybe 35 years ago and I would like to not screw it up, or dye myself more than the clothes.
I have a clean 5-gallon bucket I'm willing to sacrifice for this. Is there more to it than put the dye in the bucket, add water, add shirts, and let it sit? I can't help feeling like that's too simple.