I said I sort my fabric for pre-washing, but was just wondering outloud why I bother.
Once they are sewn together they are all going to be washed together, right?
I do think the separated colors for pre-wash will diminish the running of darker colors into the lighter colors.
As a side note; I was prewashing a red and white print with a solid white that was to go with it. The red and white stayed like it was printed, but the white piece turned pink. I soaked that one in Oxy-Clean and it took the pink out of it.
This is for a garment, so I think I will try washing them together one more time before making up the garment (unless I can live with a pink trim).