Originally Posted by
Scissor Queen
That's when you have an actual problem. If the white picks up the blue then you need to determine if it'll wash back out. It generally will because you have to do something chemically to set modern chemical dyes. Most of the time a wash with lots of water and OxyClean will take out excess dyes fabrics have picked up. There used to be a product made just for taking out dyes that other fabrics had picked up. I think it was made by Carbonara but I wouldn't swear to it.
Just have to add that waiting till a problem reveals itself , when there is all likelihood that it will, and saying "most times" it will remove with water is not a sure solution. Deal with it prior to construction by prewashing till the water comes clear... or wash with synthropol if prewashing/treating is no longer an option.
I sew 100's of yards of batiks every year and would never ever trust any one of them not to bleed. I spend countless hours piecing and would never want the heartbreak of a bleed that could have been prevented.