One of my washing issues - even on garments - is
What do I wash my black and white striped shirt with? I don't like to put it with the whites/lights - and I definitely don't want to put it wit the darks - and I hate to wash just one item at a time.
My concern when making an item with high contrast colors - I don't want the lighter color to pick up dye from any of the darker/brighter colors.
As Scissor Queen has pointed out many times - SOME fabrics do seem to be dye resistant -
and I'm pointing out that SOME fabrics seem to be dye MAGNETS.